mmc: core: add a debug message for SET_BLOCK_COUNT

This patch is added just debug message.  Almost features need to use the
CMD23.  But we didn't see the debug message for sbc.  If sbc's message
can see, should be help for debugging.  (We can check whether use the
cmd23 or not.)
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

drivers/mmc/core/core.c

@@ -188,6 +188,12 @@ mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
 	struct scatterlist *sg;
 #endif
 
+	if (mrq->sbc) {
+		pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
+			 mmc_hostname(host), mrq->sbc->opcode,
+			 mrq->sbc->arg, mrq->sbc->flags);
+	}
+
 	pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
 		 mmc_hostname(host), mrq->cmd->opcode,
 		 mrq->cmd->arg, mrq->cmd->flags);