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
defconfigs: mogami/zeus: Split the 8MB cache to 4MB cache and 4MB userdata

In a rare case of userdata failure, kernel will take values
from ATAG which which be in conflict with system.
It's better to define location of userdata beforehand.

Thanks to @karandpr

Change-Id: Id0545ea57d91780711755f22eb6b7bad6491d66a