Revert "drm/amd/pm: correct the workload setting"

This reverts commit 74e10064.

This causes a regression in the workload selection.
A more extensive fix is being worked on.
For now, revert.

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/3618


Fixes: 74e10064 ("drm/amd/pm: correct the workload setting")
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>