Make alock_rw a bit field

Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>

Author: Robert Baldyga

src/ocf_request.h

@@ -254,6 +254,9 @@ struct ocf_request {
 	uint8_t rw : 1;
 	/*!< Indicator of IO direction - Read/Write */
 
+	uint8_t alock_rw: 1;
+	/*!< Read/Write mode for alock*/
+
 	uint8_t d2c : 1;
 	/**!< request affects metadata cachelines (is not direct-to-core) */
 
@@ -309,9 +312,6 @@ struct ocf_request {
 
 	struct ocf_req_discard_info discard;
 
-	uint32_t alock_rw;
-	/*!< Read/Write mode for alock*/
-
 	uint8_t *alock_status;
 	/*!< Mapping for locked/unlocked alock entries */