Add user voltage control

Change-Id: Ia8fa1357c9c6abe4afe34ce7fd534eaad9e484e8
Change 1150 from being set for vmin

Change-Id: Ib97b2fc14212dcc7250b0f8d5cac17bdb2dd4b68
GPU OC to 480Mhz

Change-Id: I2d7dba9840811bb3ac07292a3cd121b8e633fd15