drm/amdgpu: add RAS callback for gfx

Add functions for RAS error inject and query error counter
Signed-off-by: Dennis Li <Dennis.Li@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h

@@ -196,6 +196,8 @@ struct amdgpu_gfx_funcs {
 				uint32_t *dst);
 	void (*select_me_pipe_q)(struct amdgpu_device *adev, u32 me, u32 pipe,
 				 u32 queue, u32 vmid);
+	int (*ras_error_inject)(struct amdgpu_device *adev, void *inject_if);
+	int (*query_ras_error_count) (struct amdgpu_device *adev, void *ras_error_status);
 };
 
 struct amdgpu_ngg_buf {