LOWMEMKILLER: allow to kill protected APPS only if > 80000KB RAM

So now if protected app has mem leak, and will grow to HUGE mem users
and there will be OOM, it's will be killed! :)

One less bug in RAM.

Big Thanks to @Alucard for help!

Signed-off-by: Dan Trifan <jimsth@gmail.com>
arch:arm:configs: disable CLEANCACHE and FRONTSWAP

It's was made for SWAP file, and when used with ZRAM, we have big problem,
as this code try to swap as much as possible to free read RAM,
so ZRAM filled to max, and then system hang! as it's filled the RAM!
not the swap file/partition.

Thx Dorimanx

Signed-off-by: Dan Trifan <jimsth@gmail.com>