Replace use of overlayfs' override_creds with overlay_remounter

This new solution does not require the use of non-upstreamed
override_creds patches.

Test: system/core/fs_mgr/tests/adb-remount-test.sh
Bug: 388912628
Change-Id: I2bc86a7171c014f88786c6ab97c8788ad024b264
7 files changed