mmc: card: Do not scan RPMB partitions

Do not scan rpmb partitions for "soft" partitions, since the rpmb
partition contains protected data. Silences the following message
during boot:

mmcblkXRPMB: unknown partition table

Signed-off-by: Johan Rudholm <[e-mail]>
Reviewed-by: Namjae Jeon <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Acked-by: Krishna Konda <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

drivers/mmc/card/block.c

···
 	md->disk->queue = md->queue.queue;
 	md->disk->driverfs_dev = parent;
 	set_disk_ro(md->disk, md->read_only || default_ro);
+	if (area_type & MMC_BLK_DATA_AREA_RPMB)
+		md->disk->flags |= GENHD_FL_NO_PART_SCAN;
 
 	/*
 	 * As discussed on lkml, GENHD_FL_REMOVABLE should: