drm/amdgpu: set GART PTE asic specific flags

Set asic specific gart pte flags in the gmc IP module for
each asic.

Signed-off-by: Alex Xie <AlexBin.Xie@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 2541d70..abf2b39 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -524,6 +524,10 @@ struct amdgpu_gart {
 	struct page			**pages;
 #endif
 	bool				ready;
+
+	/* Asic default pte flags */
+	uint64_t			gart_pte_flags;
+
 	const struct amdgpu_gart_funcs *gart_funcs;
 };