msm: camera: Fix VPE clock & regulator on 3.4 kernel

Change-Id: I1a5d310a5c4730a17e2280ba3b6020eb878fe8e3
msm: camera: Update camera code to use clk_prepare api

Change-Id: I7998a2212b2556b2c829c791975cd2e72f0b2946
Merge remote-tracking branch 'upstream/cm-11.0' into cm-11.0