fs/Makefile: Always inspect exofs/

fs/exofs directory has multiple targets now, of which the
ore.ko will be needed by the pnfs-objects-layout-driver
(fs/nfs/objlayout).

As suggested by: Michal Marek <[e-mail]> convert
inclusion of exofs/ from obj-$(CONFIG_EXOFS_FS) => obj-$(y).
So ORE can be selected also from fs/nfs/Kconfig

CC: Michal Marek <[e-mail]>
CC: Al Viro <[e-mail]>
Signed-off-by: Boaz Harrosh <[e-mail]>

fs/Makefile

···
 obj-$(CONFIG_OCFS2_FS)		+= ocfs2/
 obj-$(CONFIG_BTRFS_FS)		+= btrfs/
 obj-$(CONFIG_GFS2_FS)           += gfs2/
-obj-$(CONFIG_EXOFS_FS)          += exofs/
+obj-$(y)          		+= exofs/ # Multiple mods, used by nfs/objlayout
 obj-$(CONFIG_CEPH_FS)		+= ceph/
 obj-$(CONFIG_PSTORE)		+= pstore/