userns: Convert hostfs to use kuid and kgid where appropriate

Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

init/Kconfig

@@ -957,8 +957,6 @@ config UIDGID_CONVERTED
 	depends on UFS_FS = n
 	depends on XFS_FS = n
 
-	depends on !UML || HOSTFS = n
-
 	# The rare drivers that won't build
 	depends on ANDROID_BINDER_IPC = n