drm/amdgpu: add HDP asic callbacks for SOC15 (v2)
Needed to flush and invalidate the HDP block using the CPU. v2: use preferred register on soc15. Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: Samuel Li <Samuel.Li@amd.com> (v1)
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