Revert "mali: bump step1 to 200MHz"

This reverts commit 6db0665e3858c05bf1cf7bf7a5fe312ef4af459c.
mali: 3-step dvfs with adjusted thresholds

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

Change-Id: I8f6321bd638c503954fc47d63cff41067a8ec7ef