[6/7] vold: exFAT Support

FUSE based exFAT Implementation

android: https://gerrit.omnirom.org/#/c/4448/
e2fsprogs: https://gerrit.omnirom.org/#/c/3191/
fuse: https://gerrit.omnirom.org/#/c/4443/
sepolicy: https://gerrit.omnirom.org/#/c/4444/
vold: https://gerrit.omnirom.org/#/c/4441/
omni: https://gerrit.omnirom.org/#/c/4449/

Change-Id: I97d41b88efe941b471e3a236f92374d3587aa6c4