ANDROID: GKI: Add ANDROID_OEM_DATA(1) in struct request to support pre-read feature.

To implement the foreshow list in the kernel, we need to incorporate additional flags into the request. However, the rq_flags field currently has only 5 remaining bits. Considering the potential future usage by Android or upstream, we propose the addition of an OEM data field to prevent conflicts down the line.

Bug: 339338545

Change-Id: I965450a06a365b53ae82d11bd678983c6c286f1a
Signed-off-by: LongPing Wei <weilongping@oppo.com>
(cherry picked from commit 943f2856e40751d7971de33b6d75c7a23df7139d)

include/linux/blk-mq.h

@@ -208,6 +208,8 @@ struct request {
 	 */
 	rq_end_io_fn *end_io;
 	void *end_io_data;
+
+	ANDROID_OEM_DATA(1);
 };
 
 static inline enum req_op req_op(const struct request *req)