drm/i915/gt: Enable read back on XEHP_FF_MODE2
Contrary to GEN12_FF_MODE2, platforms using XEHP_FF_MODE2 are not affected by Wa_1608008084, hence read back can be enabled. Signed-off-by:Lucas De Marchi <lucas.demarchi@intel.com> Reviewed-by:
Kenneth Graunke <kenneth@whitecape.org> Link: https://patchwork.freedesktop.org/patch/msgid/20230630203509.1635216-6-lucas.demarchi@intel.com
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fc311f11
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