fanotify: select ANON_INODES.

fanotify references anon_inode_getfd(), which is only available with
ANON_INODES enabled. Presently this bails out with the following:

  LD      vmlinux
fs/built-in.o: In function `sys_fanotify_init':
(.text+0x26d1c): undefined reference to `anon_inode_getfd'
make: *** [vmlinux] Error 1

which is trivially corrected by adding an ANON_INODES select.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Eric Paris <eparis@redhat.com>