Revert "remove min_free_kbytes tweak"

This reverts commit e346dabc0dfcc6bab6555feb5e3c4f7b6e7c538b.

bcmdhd.ko is still having issues with the default.
Merge branch 'cm-11.0' of https://github.com/Mustaavalkosta/android_device_htc_ace into cd-4.4