gpu control: Global voltage delta (yank555-lu)

Change-Id: I29e2063b17acf93bddf539201be20c579169ced3

Conflicts:

	drivers/gpu/mali400/r3p2/mali/platform/pegasus-m400/exynos4_pmm.c

Conflicts:

	drivers/gpu/mali400/r3p2/mali/platform/pegasus-m400/exynos4_pmm.c