drm/amdgpu: add new asic callbacks for HDP flush/invalidation
Needed to properly flush the HDP cache with the CPU from rather than the GPU. Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NSamuel Li <Samuel.Li@amd.com>
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