Command usage cleanup

Remove command name from all command "usage" fields and update
common/command.c to display "name - usage" instead of
just "usage". Also remove newlines from command usage fields.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/g2000/g2000.c b/board/g2000/g2000.c
index 48fc643..b35038d 100644
--- a/board/g2000/g2000.c
+++ b/board/g2000/g2000.c
@@ -185,7 +185,7 @@
 }
 U_BOOT_CMD(
 	dumpebc,	1,	1,	do_dumpebc,
-	"dumpebc - Dump all EBC registers\n",
+	"Dump all EBC registers",
 	NULL
 );
 
@@ -207,7 +207,7 @@
 }
 U_BOOT_CMD(
 	dumpdcr,	1,	1,	do_dumpdcr,
-	"dumpdcr - Dump all DCR registers\n",
+	"Dump all DCR registers",
 	NULL
 );
 
@@ -271,7 +271,7 @@
 }
 U_BOOT_CMD(
 	dumpspr,	1,	1,	do_dumpspr,
-	"dumpspr - Dump all SPR registers\n",
+	"Dump all SPR registers",
 	NULL
 );
 #endif