drm/i915: Program VLV/CHV PIPE_MSA_MISC register

VLV/CHV have an extra register to configure some stereo3d
signalling details via DP MSA. Make sure we reset that
register to zero (since we don't do any stereo3d stuff).

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230314130255.23273-5-ville.syrjala@linux.intel.com


Reviewed-by: Jouni Högander <jouni.hogander@intel.com>