drm/i915: Remove XEHP_FWRANGES()

Now that DG2 is the only user of this forcewake table, remove the macro
and use FORCEWAKE_RENDER explicitly for range 0xd800 - 0xd87f.
Suggested-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Acked-by: Tvrtko Ursulin <tursulin@ursulin.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20240320060543.4034215-3-lucas.demarchi@intel.comSigned-off-by: Lucas De Marchi <lucas.demarchi@intel.com>