fs: readdir: Fix su hide patch for non-iterate filesystems
* 3.10 doesn't normally use iterate for filesystems,
but it was backported in hopes of removing vfs_readdir()
* Because the romnt variable was only set for filesystems
using iterate, the su hide patches were broken for many
filesytems like ext4, which still use vfs_readdir()
instead of iterate_dir() like their mainline counterparts
* Remove the iterate check around setting romnt to fix this
Change-Id: I26426683df0fd199a80f053294f352e31754bec5