Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/md/dm-sysfs.c b/drivers/md/dm-sysfs.c
index c209b8a..a05fcd5 100644
--- a/drivers/md/dm-sysfs.c
+++ b/drivers/md/dm-sysfs.c
@@ -92,7 +92,8 @@
 
 static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf)
 {
-	sprintf(buf, "%d\n", dm_use_blk_mq(md));
+	/* Purely for userspace compatibility */
+	sprintf(buf, "%d\n", true);
 
 	return strlen(buf);
 }