acpuclock/cpufreq: custom voltage control
acpuclock: initial overclock implementation

Will improve later if there's enough demand

Change-Id: I987295653e41f0968daa9cce49ce636282c2be48
8960-regulator: lower voltage limit for UV folks

Change-Id: I8b4c8b1b8d81114f49aabf402263f66b3c9856d7