drm/radeon/cik: use POLL_REG_MEM special op for sDMA HDP flush
This is the preferred flushing method on CIK.
Signed-off-by:  Alex Deucher <alexander.deucher@amd.com>
Alex Deucher <alexander.deucher@amd.com>
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This is the preferred flushing method on CIK.
Signed-off-by:  Alex Deucher <alexander.deucher@amd.com>
Alex Deucher <alexander.deucher@amd.com>