fanotify: FMODE_NONOTIFY and __O_SYNC in sparc conflict

sparc used the same value as FMODE_NONOTIFY so change FMODE_NONOTIFY to be
something unique.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Eric Paris <eparis@redhat.com>