Allow recovery to create device nodes and modify rootfs

tilapia's OTA code for updating the radio image needs to
create files on rootfs and create a character device in /dev.
Add an exception for recovery the the various neverallow rules
blocking this behavior.

Bug: 18281224
Change-Id: I5c57afe0a10b4598fea17f9c5c833bd39551907e
Fix sepolicy

slim: https://gerrit.slimroms.net/#/c/16473/
Ifa13f076b35c350f34877457737b9a2b6073f622
[1/2] Add EdgeGesture.

Change-Id: Ica17323066e5cadb35a1832c13c1b93c97ed4247
Revert "[1/2] Add EdgeGesture."

Moded to vendor/mv

This reverts commit 1620647a2339b639672c8e2a8a3e324c70d63f81.