clock-krait/cpufreq: custom voltage control v1 (Imoseyon)

(cherry picked from commit 1802748b3f6f64ab7c045a3bfc7cfe182e585ca4)

Change-Id: Id6604bb1639fdf3c474188c9efb5eee94273be63 (reverted from commit 5e2129bb085b8c31acf0095d51fe41df9d562b41)
user voltage control (flar2)