MTP: Use fork instead of pthread

Change-Id: I95cf6f4def0c86f40c775738f0712323f0a0f146
update exfat from current head

Change-Id: I7d93474296612fda1dde23f6e8690668d6880e27
Merge pull request #1 from omnirom/android-4.4

merge into kk4.4