Emulate media encryption, always chmod to unlock.

When FBE emulation is enabled, lock/unlock the media directories that
store emulated SD card contents.

Change unlocking logic to always chmod directories back to known
state so that we can recover devices that have disabled FBE
emulation.

Bug: 26010607, 26027473
Change-Id: I6d4bff25d8ad7b948679290106f585f777f7a249
3 files changed