drm_hwcomposer: Initial stub HWC2

This patch adds the HWC2 interface to drm_hwc, and stubs out all
functionality.

Change-Id: I65b09e7266e887dd184c0c345016d5a768f6349a
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
3 files changed