drm/amd/powerplay: guard consistency between CPU copy and local VRAM
This can prevent CPU to use the out-dated copy. Signed-off-by:Evan Quan <evan.quan@amd.com> Reviewed-by:
Kenneth Feng <kenneth.feng@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com>
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