EVS patches from AOSP

Apply a couple of minor fixes recieved via AOSP patches to the sample
EVS driver and evs application.
Header guards added
MIPs turned off for video texture
Video buffer released from gl context at end of each frame

Bug: 111402303
Test: Build mojave
Change-Id: Ic96a91601b74030a894f8a3f5182709af0c761d0
5 files changed