drm/radeon: consolidate cp hdp flushing code for CIK
It's used in several places so move to a common shared
function.
Signed-off-by: 
Alex Deucher <alexander.deucher@amd.com>
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It's used in several places so move to a common shared
function.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>