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On APUs power is SoC power, not just GPU.
Clarify that for UVD/VCE/VCN the IP is powered down,
not disabled which can confusing and lead to concerns
that the IP is actually not available.
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>