drm/i915/dg2: Add Wa_15010599737

This workaround may need to be extended to other platforms soon, but for
now it's marked as DG2-specific.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220708215804.2889246-1-matthew.d.roper@intel.com