drm/amdgpu: add pa_sc_tile_steering_override to drm_amdgpu_info_device

the initial/default value of pa_sc_tile_steering_override need to
be exposed to user mode driver
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

include/uapi/drm/amdgpu_drm.h

@@ -992,6 +992,8 @@ struct drm_amdgpu_info_device {
 	__u64 high_va_offset;
 	/** The maximum high virtual address */
 	__u64 high_va_max;
+	/* gfx10 pa_sc_tile_steering_override */
+	__u32 pa_sc_tile_steering_override;
 };
 
 struct drm_amdgpu_info_hw_ip {