drm/i915: Widen the QGV point mask

drm/i915: Widen the QGV point mask

adlp+ adds some extra bits to the QGV point mask. The code attempts
to handle that but forgot to actually make sure we can store those
bits in the bw state. Fix it.

Cc: stable@vger.kernel.org
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Fixes: b4f7e1c237d4 ("drm/i915: Implement PSF GV point support")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220214091811.13725-4-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>