mmc_block: filter out PC requests

We do not support PC (SCSI) commands, so don't pretend we do by
letting them through.

Signed-off-by: Pierre Ossman <[e-mail]>

drivers/mmc/card/queue.c

···
 	/*
 	 * We only like normal block requests.
 	 */
-	if (!blk_fs_request(req) && !blk_pc_request(req)) {
+	if (!blk_fs_request(req)) {
 		blk_dump_rq_flags(req, "MMC bad request");
 		return BLKPREP_KILL;
 	}