drm/amd/pm: Reset max GFX clock after disabling determinism

When determinism mode is disabled on aldebaran, max GFX clock will
be reset to default max frequency value.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>