drm/i915: Add port A HPD support for SPT
On SKL the port A HPD has moved to the PCH. Hook it up. Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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