[XFS] Fix up some Kconfig merging issues

fs/Kconfig

@@ -1156,6 +1156,18 @@ config XFS_QUOTA
 	  with or without the generic quota support enabled (CONFIG_QUOTA) -
 	  they are completely independent subsystems.
 
+config XFS_POSIX_ACL
+	bool "ACL support"
+	depends on XFS_FS
+	---help---
+	  Posix Access Control Lists (ACLs) support permissions for users and
+	  groups beyond the owner/group/world scheme.
+
+	  To learn more about Access Control Lists, visit the Posix ACLs for
+	  Linux website <http://acl.bestbits.at/>.
+
+	  If you don't know what Access Control Lists are, say N
+
 
 menu "Network File Systems"
 	depends on NET