cpufreq: interactive: Enable CPU utilization statistics

 * Notify of CPU utilization on the speedchange task. This is required
   for MPDecision to properly consider hotplug scenarios.

Change-Id: If01a2efb7a7630544b16c782989406ac44865f61
tuna_ak_defconfig: Disable Big Stack Frame Warning FRAME_WARN=0
Kernel Version: AK.085