Remove GENHD_FL_DRIVERFS

This flag is not used, so best discarded.

Signed-off-by: NeilBrown <neilb@suse.de>
--
Hi Jens,
 I came across this recently - these are the only two occurances
 of "GENHD_FL_DRIVERFS" in the kernel, so it cannot be needed.
NeilBrown
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 56b5051..5f2f4c4 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -109,7 +109,7 @@
 };
 
 #define GENHD_FL_REMOVABLE			1
-#define GENHD_FL_DRIVERFS			2
+/* 2 is unused */
 #define GENHD_FL_MEDIA_CHANGE_NOTIFY		4
 #define GENHD_FL_CD				8
 #define GENHD_FL_UP				16