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_vfd.c b/common/cmd_vfd.c
index ef4dd83..84d9530 100644
--- a/common/cmd_vfd.c
+++ b/common/cmd_vfd.c
@@ -67,7 +67,7 @@
 
 U_BOOT_CMD(
 	vfd,	2,	0,	do_vfd,
-	"vfd     - load a bitmap to the VFDs on TRAB\n",
+	"load a bitmap to the VFDs on TRAB",
 	"/N\n"
 	"    - load bitmap N to the VFDs (N is _decimal_ !!!)\n"
 	"vfd ADDR\n"