ceph: Enable building when user namespaces are enabled.

Now that conversions happen from kuids and kgids when generating ceph
messages and conversion happen to kuids and kgids after receiving
celph messages, and all intermediate data structures store uids and
gids as type kuid_t and kgid_t it is safe to enable ceph with
user namespace support enabled.

Cc: Sage Weil <sage@inktank.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

init/Kconfig

@@ -1076,7 +1076,6 @@ config UIDGID_CONVERTED
 	# Filesystems
 	depends on 9P_FS = n
 	depends on AFS_FS = n
-	depends on CEPH_FS = n
 	depends on CIFS = n
 	depends on CODA_FS = n
 	depends on GFS2_FS = n