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/common/cmd_bmp.c b/common/cmd_bmp.c
index e60f18b..abbb070 100644
--- a/common/cmd_bmp.c
+++ b/common/cmd_bmp.c
@@ -139,7 +139,7 @@
 
 U_BOOT_CMD(
 	bmp,	5,	1,	do_bmp,
-	"bmp     - manipulate BMP image data\n",
+	"manipulate BMP image data",
 	"info <imageAddr>          - display image info\n"
 	"bmp display <imageAddr> [x y] - display image at x,y\n"
 );