Revert "blktrace: Trace remapped requests correctly"

This reverts commit 1ed71e6bce which is
commit 22c80aac882f712897b88b7ea8f5a74ea19019df upstream.

It breaks the Android GKI kernel abi, and is not needed for Android
devices, so revert it for now.  If it is needed for this branch, it can
come back later in an ABI-stable way.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I75de120370233d680e33d91d21ed55c2396ed2d0

kernel/trace/blktrace.c

@@ -1100,7 +1100,7 @@ static void blk_add_trace_rq_remap(void *ignore, struct request *rq, dev_t dev,
 	r.sector_from = cpu_to_be64(from);
 
 	__blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq),
-			req_op(rq), rq->cmd_flags, BLK_TA_REMAP, 0,
+			rq_data_dir(rq), 0, BLK_TA_REMAP, 0,
 			sizeof(r), &r, blk_trace_request_get_cgid(rq));
 	rcu_read_unlock();
 }