Merge changes Ia8e9907e,I9bfbec5a,I8175c232,Ice27e78c into msm-3.4

* changes:
  msm_fb: mdss: Add support for DSI specific regulators
  msm: clock-8974: Add initial DSI PLL support
  msm: 8974: Add support for DSI PLL control through clock driver
  iopoll: Introduce the readl_iopoll_timeout_noirq macro