env: Rename setenv() to env_set()

We are now using an env_ prefix for environment functions. Rename setenv()
for consistency. Also add function comments in common.h.

Suggested-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/overo/overo.c b/board/overo/overo.c
index adf33cf..140e34d 100644
--- a/board/overo/overo.c
+++ b/board/overo/overo.c
@@ -172,47 +172,47 @@
 			expansion_config.revision,
 			expansion_config.fab_revision);
 		MUX_GUMSTIX();
-		setenv("defaultdisplay", "dvi");
-		setenv("expansionname", "summit");
+		env_set("defaultdisplay", "dvi");
+		env_set("expansionname", "summit");
 		break;
 	case GUMSTIX_TOBI:
 		printf("Recognized Tobi expansion board (rev %d %s)\n",
 			expansion_config.revision,
 			expansion_config.fab_revision);
 		MUX_GUMSTIX();
-		setenv("defaultdisplay", "dvi");
-		setenv("expansionname", "tobi");
+		env_set("defaultdisplay", "dvi");
+		env_set("expansionname", "tobi");
 		break;
 	case GUMSTIX_TOBI_DUO:
 		printf("Recognized Tobi Duo expansion board (rev %d %s)\n",
 			expansion_config.revision,
 			expansion_config.fab_revision);
 		MUX_GUMSTIX();
-		setenv("expansionname", "tobiduo");
+		env_set("expansionname", "tobiduo");
 		break;
 	case GUMSTIX_PALO35:
 		printf("Recognized Palo35 expansion board (rev %d %s)\n",
 			expansion_config.revision,
 			expansion_config.fab_revision);
 		MUX_GUMSTIX();
-		setenv("defaultdisplay", "lcd35");
-		setenv("expansionname", "palo35");
+		env_set("defaultdisplay", "lcd35");
+		env_set("expansionname", "palo35");
 		break;
 	case GUMSTIX_PALO43:
 		printf("Recognized Palo43 expansion board (rev %d %s)\n",
 			expansion_config.revision,
 			expansion_config.fab_revision);
 		MUX_GUMSTIX();
-		setenv("defaultdisplay", "lcd43");
-		setenv("expansionname", "palo43");
+		env_set("defaultdisplay", "lcd43");
+		env_set("expansionname", "palo43");
 		break;
 	case GUMSTIX_CHESTNUT43:
 		printf("Recognized Chestnut43 expansion board (rev %d %s)\n",
 			expansion_config.revision,
 			expansion_config.fab_revision);
 		MUX_GUMSTIX();
-		setenv("defaultdisplay", "lcd43");
-		setenv("expansionname", "chestnut43");
+		env_set("defaultdisplay", "lcd43");
+		env_set("expansionname", "chestnut43");
 		break;
 	case GUMSTIX_PINTO:
 		printf("Recognized Pinto expansion board (rev %d %s)\n",
@@ -225,8 +225,8 @@
 			expansion_config.revision,
 			expansion_config.fab_revision);
 		MUX_GUMSTIX();
-		setenv("defaultdisplay", "lcd43");
-		setenv("expansionname", "gallop43");
+		env_set("defaultdisplay", "lcd43");
+		env_set("expansionname", "gallop43");
 		break;
 	case GUMSTIX_ALTO35:
 		printf("Recognized Alto35 expansion board (rev %d %s)\n",
@@ -234,8 +234,8 @@
 			expansion_config.fab_revision);
 		MUX_GUMSTIX();
 		MUX_ALTO35();
-		setenv("defaultdisplay", "lcd35");
-		setenv("expansionname", "alto35");
+		env_set("defaultdisplay", "lcd35");
+		env_set("expansionname", "alto35");
 		break;
 	case GUMSTIX_STAGECOACH:
 		printf("Recognized Stagecoach expansion board (rev %d %s)\n",
@@ -261,8 +261,8 @@
 			expansion_config.fab_revision);
 		MUX_GUMSTIX();
 		MUX_ARBOR43C();
-		setenv("defaultdisplay", "lcd43");
-		setenv("expansionname", "arbor43c");
+		env_set("defaultdisplay", "lcd43");
+		env_set("expansionname", "arbor43c");
 		break;
 	case ETTUS_USRP_E:
 		printf("Recognized Ettus Research USRP-E (rev %d %s)\n",
@@ -270,13 +270,13 @@
 			expansion_config.fab_revision);
 		MUX_GUMSTIX();
 		MUX_USRP_E();
-		setenv("defaultdisplay", "dvi");
+		env_set("defaultdisplay", "dvi");
 		break;
 	case GUMSTIX_NO_EEPROM:
 	case GUMSTIX_EMPTY_EEPROM:
 		puts("No or empty EEPROM on expansion board\n");
 		MUX_GUMSTIX();
-		setenv("expansionname", "tobi");
+		env_set("expansionname", "tobi");
 		break;
 	default:
 		printf("Unrecognized expansion board 0x%08x\n", expansion_id);
@@ -284,14 +284,14 @@
 	}
 
 	if (expansion_config.content == 1)
-		setenv(expansion_config.env_var, expansion_config.env_setting);
+		env_set(expansion_config.env_var, expansion_config.env_setting);
 
 	omap_die_id_display();
 
 	if (get_cpu_family() == CPU_OMAP34XX)
-		setenv("boardname", "overo");
+		env_set("boardname", "overo");
 	else
-		setenv("boardname", "overo-storm");
+		env_set("boardname", "overo-storm");
 
 	return 0;
 }