Add voltage control to kconfig

I must have missed that part of the patch

Change-Id: I0b1bd7de1cb6f17fd2374c2d4c4cd1ca48c7c5b7
Lower VM_MAX_READAHEAD to 256 kb

I got overruled. And init.d sets it to 256 kb anyways, so changing it here isn't going to do much

Change-Id: I84443b743e838ee91ff507e3673542993008a6e2
Merge "Lower VM_MAX_READAHEAD to 256 kb" into sonic-dev
Merge branch 'sonic_dev' of https://github.com/VanirAOSP/android_kernel_htc_m7 into HEAD