cpufreq: make thermal-engine play nicely with OC

* not perfect yet but should do for now

Conflicts:

	drivers/cpufreq/cpufreq.c

Conflicts:
	drivers/cpufreq/cpufreq.c

Change-Id: Id47016f2ae67893a8d0fc5f631ecc2db30a8dd82
defconfig: disable scaling_min_freq store

Change-Id: I316ed800558c3b0cb271c70ce75c7d297edd4b7c
build-script: some more improvements

Change-Id: I4eedd3b2b6b0be82d68a10d4ac5b2b5542c850ba