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>

board/r360mpi/r360mpi.c

@@ -414,6 +414,6 @@ int do_kbd (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 
 U_BOOT_CMD(
 	kbd,	1,	1,	do_kbd,
-	"kbd     - read keyboard status\n",
+	"read keyboard status",
 	NULL
 );