Get rid of the gfx buffer workarounds

Concurrent buffers are now working, we don't need this crap anymore

Change-Id: I80c35bb67c41e9c61faeb6f3cd80d3e9033f9641
(cherry picked from commit 0607cc2b4c09b08c0b7205e6bf2c2f3431a498c1)
Treat all screenshots as going to a CPU consumer

Change-Id: Iee55fa03d9602f31a3b7f4f188778c58e8ca0131
(cherry picked from commit cd27cba5132a61e1385d5c805e0f1b49dd51e070)