Revert "drm/amd/pm: fix workload mismatch on vega10"

This reverts commit 0979d432

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Revert this because it does not apply to all the cards.

Signed-off-by: Kenneth Feng <kenneth.feng@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>