drm_hwcomposer: integrate GLCompositor with hwcomposer

This patch makes it such that HWC will always composite all layers even if
there are too few HW planes. Any layers that do not fit in a plane get
rendered into a screen sized buffer by GLCompositor, the result of which uses
up one of the available HW planes.

Change-Id: Ibd560ae4c536632ac32d965152ceacd92bbba39f
2 files changed