drm/i915/guc: remove writes to GEN8_DRBREG registers
These registers are not actually writable by the CPU; only the GuC can actually program them. So let's not do writes that have no effect. Signed-off-by: NDave Gordon <david.s.gordon@intel.com> Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
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