sdcard: Respect check_caller_access_to_name on readdir() calls

While looking at a blocked path failed as expected when trying
to access it with a stat(), read(), or getattr(), readdir() still
returned the entry, making devices with mounted external storage fail
com.android.cts.appsecurity.AppSecurityTests#testExternalStorageWrite
by trying to interact with otherwise invisible paths.

Fixit by skipping all entries that would've been made invisible at
LOOKUP

Change-Id: Ia8afac0703fa10f78c89046f029776bd290e4846