Revert "Revert "remove min_free_kbytes tweak""

This reverts commit bbd7a457fce8ea47d05b3b8e575f9c68ed251266.

Let's see if bcmdhd behaves correctly with default now that
it's built in the kernel instead of being a module.
Merge branch 'cm-11.0' of https://github.com/Mustaavalkosta/android_device_htc_ace into cd-4.4