md: allow SET_BITMAP_FILE to work on 64bit kernel with 32bit userspace

..  so that you can use bitmaps with 32bit userspace on a 64 bit kernel.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Adrian Bunk <bunk@kernel.org>

include/linux/compat_ioctl.h

@@ -120,6 +120,8 @@ ULONG_IOCTL(START_ARRAY)
 COMPATIBLE_IOCTL(STOP_ARRAY)
 COMPATIBLE_IOCTL(STOP_ARRAY_RO)
 COMPATIBLE_IOCTL(RESTART_ARRAY_RW)
+COMPATIBLE_IOCTL(GET_BITMAP_FILE)
+ULONG_IOCTL(SET_BITMAP_FILE)
 /* DM */
 COMPATIBLE_IOCTL(DM_VERSION_32)
 COMPATIBLE_IOCTL(DM_REMOVE_ALL_32)