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/tqc/tqm8272/tqm8272.c b/board/tqc/tqm8272/tqm8272.c
index 5d0741d..5bc080f 100644
--- a/board/tqc/tqm8272/tqm8272.c
+++ b/board/tqc/tqm8272/tqm8272.c
@@ -866,7 +866,7 @@
 
 U_BOOT_CMD(
 	  hwib, 1,	1,	do_hwib_dump,
-	  "hwib	   - dump HWIB'\n",
+	  "dump HWIB'",
 	  "\n"
 );