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/mpl/mip405/cmd_mip405.c b/board/mpl/mip405/cmd_mip405.c
index 6ad95b5..dc13804 100644
--- a/board/mpl/mip405/cmd_mip405.c
+++ b/board/mpl/mip405/cmd_mip405.c
@@ -55,7 +55,7 @@
 }
 U_BOOT_CMD(
 	mip405,	8,	1,	do_mip405,
-	"mip405  - MIP405 specific Cmds\n",
+	"MIP405 specific Cmds",
 	"flash mem [SrcAddr] - updates U-Boot with image in memory\n"
 	"mip405 flash mps - updates U-Boot with image from MPS\n"
 	"mip405 info      - displays board information\n"