Get rid of the gfx buffer workarounds

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

Change-Id: I80c35bb67c41e9c61faeb6f3cd80d3e9033f9641
Treat all screenshots as going to a CPU consumer

Change-Id: Iee55fa03d9602f31a3b7f4f188778c58e8ca0131