block: Fix secure erase

Commit 288dab8a35a0 ("block: add a separate operation type for secure
erase") split REQ_OP_SECURE_ERASE from REQ_OP_DISCARD without considering
all the places REQ_OP_DISCARD was being used to mean either. Fix those.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Fixes: 288dab8a35a0 ("block: add a separate operation type for secure erase")
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 48a5dd7..82503e6 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1726,6 +1726,7 @@
 			break;
 
 		if (req_op(next) == REQ_OP_DISCARD ||
+		    req_op(next) == REQ_OP_SECURE_ERASE ||
 		    req_op(next) == REQ_OP_FLUSH)
 			break;