attempt2 with 5.6.19.

Author: dettus

sys/external/bsd/drm2/dist/drm/i915/gt/intel_gtt.h

@@ -570,10 +570,6 @@ struct i915_ppgtt *i915_ppgtt_create(struct intel_gt *gt);
 void i915_gem_suspend_gtt_mappings(struct drm_i915_private *i915);
 void i915_gem_restore_gtt_mappings(struct drm_i915_private *i915);
 
-u64 gen8_pte_encode(dma_addr_t addr,
-		    enum i915_cache_level level,
-		    u32 flags);
-
 int setup_page_dma(struct i915_address_space *vm, struct i915_page_dma *p);
 void cleanup_page_dma(struct i915_address_space *vm, struct i915_page_dma *p);