drm/i915/xelpmp: Don't assume workarounds extend to future platforms

The currently implemented Xe_LPM+ workarounds are specific to media
version 13.00.  When new IP versions show up in the future, they'll need
their own workaround lists.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230821180619.650007-13-matthew.d.roper@intel.com