cpufreq: 1800MHz support
(cherry picked from commit d5df333213073256d4e8b50d31e9649153cdf39b)
(cherry picked from commit 26854942e41ae9d8dcf53de8203192f9dda2760d)
(cherry picked from commit bdc2e5fd535b16d9ca9720da5f2fbfb0e64ba1e0)

Conflicts:

	arch/arm/mach-exynos/cpufreq-4x12.c