drm/i915: Save/restore HWS_PGA on suspend/resume
It fixes suspend/resume failure of xf86-video-intel dri2 branch. As dri2 branch doesn't call I830DRIResume() to restore hardware status page anymore, we need to preserve this register across suspend/resume. Signed-off-by: NPeng Li <peng.li@intel.com> Signed-off-by: NEric Anholt <eric@anholt.net> Signed-off-by: NDave Airlie <airlied@redhat.com>
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