Call access(2) on all files/dirs modified by Mtp

External sdcards are accessed through /mnt/media_rw,
so access() each touched file for sdcardfs to update
its metadata.

Java handles single object renames directly so that
is the only place where it is needed.

Bug: 77849654
Test: use mtp with emulated sdcard
Change-Id: Ie460398010f1fe74d8084808a6333b121674362c