cmd_mmc remove \n

This patch removes the \n after the help message for mmcinfo.
This resulted in an empty line being displayed after the mmcinfo line
when the help command was given.

Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>

common/cmd_mmc.c

@@ -136,7 +136,7 @@ int do_mmcinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 }
 
 U_BOOT_CMD(mmcinfo, 2, 0, do_mmcinfo,
-	"mmcinfo <dev num>-- display MMC info\n",
+	"mmcinfo <dev num>-- display MMC info",
 	""
 );