audit: reimplement audit_trees using fsnotify rather than inotify

Simply switch audit_trees from using inotify to using fsnotify for it's
inode pinning and disappearing act information.

Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/init/Kconfig b/init/Kconfig
index 5cff9a9..84e33c4 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -326,7 +326,7 @@
 config AUDIT_TREE
 	def_bool y
 	depends on AUDITSYSCALL
-	select INOTIFY
+	select FSNOTIFY
 
 menu "RCU Subsystem"