global: Migrate CONFIG_DFU_ALT et al to CFG

Perform simple renames of:
   CONFIG_DFU_ALT to CFG_DFU_ALT
   CONFIG_DFU_ALT_BOOT_EMMC to CFG_DFU_ALT_BOOT_EMMC
   CONFIG_DFU_ALT_BOOT_SD to CFG_DFU_ALT_BOOT_SD
   CONFIG_DFU_ALT_SYSTEM to CFG_DFU_ALT_SYSTEM
   CONFIG_DFU_ENV_SETTINGS to CFG_DFU_ENV_SETTINGS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/pico-imx6ul.h b/include/configs/pico-imx6ul.h
index faf11d5..36f648f 100644
--- a/include/configs/pico-imx6ul.h
+++ b/include/configs/pico-imx6ul.h
@@ -28,7 +28,7 @@
 
 #define DFU_DEFAULT_POLL_TIMEOUT 300
 
-#define CONFIG_DFU_ENV_SETTINGS \
+#define CFG_DFU_ENV_SETTINGS \
 	"dfu_alt_info=" \
 		"spl raw 0x2 0x400;" \
 		"u-boot raw 0x8a 0x400;" \
@@ -63,7 +63,7 @@
 	"ramdiskaddr=0x83000000\0" \
 	"scriptaddr=" __stringify(CONFIG_SYS_LOAD_ADDR) "\0" \
 	"mmcautodetect=yes\0" \
-	CONFIG_DFU_ENV_SETTINGS \
+	CFG_DFU_ENV_SETTINGS \
 	"findfdt=" \
 		"if test $fdtfile = ask ; then " \
 			"bootmenu -1; fi;" \