drm/i915: Extend QGV point restrict mask to 0x3

According to BSpec there is now also a code 0x02,
which corresponds to QGV point being rejected,
this code so lets extend mask to check this.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210531064845.4389-1-stanislav.lisovskiy@intel.com