msm: kgsl: Update GMU cold boot sequence

The second GMU cold boot should use the RPMh wake
sequence to set up the GFX rail instead of voting for the
GFX rail from GMU. Otherwise, the RPMh state will be
corrupted.

CRs-Fixed: 2017390
Change-Id: Ibce5d87c7fb59a74c3e60bff3bee27cf069c9474
Signed-off-by: George Shen <sqiao@codeaurora.org>
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>