Implement a pass through fuse daemon

Move drosen@'s permafusion.cpp to MediaProvider.
Basically a pass through implementation of a FUSE daemon - no special
logic yet.

This change doesn't include the logic around actually making MediaProvider
the FUSE daemon.

Test: some basic ls and reads (adb pull) under /sdcard/DCIM/Camera
Note: had to chown in /sdcard/DCIM to be able to open files

Change-Id: I17d1cf724318bd9144a376e776740b1e47478838
2 files changed