msm: kgsl: Do not use legacy resource control when GMU is enabled

If there is a GMU device and it is enabled, either the
GMU firmware or the GMU driver will control the clocks,
regulators, and bus vote. Bypass legacy code that does this.

CRs-Fixed: 2017390
Change-Id: Ia171e6c3c9adfb811e93bda8919819c65cb79283
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>