drm/amdgpu: cleanup get_invalidate_req v2
The two hubs are just instances of the same hardware, so the register bits are identical. v2: keep the function pointer Signed-off-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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