PL1 power limit should be disabled before loading GuC FW
From code inspection, to accelerate GuC FW load, i915 raises the GT freq to max before loading GuC FW. However, if a low PL1 power limit, the power limit will clamp GT freq and will not allow GT freq to be raised. If GuC FW load timeouts are low, this can also result in GuC FW timeouts as was seen in issue #8062 (closed).
Therefore we need a change to disable the PL1 power limit before loading GuC FW.