cpufreq: ondemand: Only start dbs_sync threads when active

Even when using parked threads, there is still a cost per hot-
plug event to have these threads started so let's avoid that
cost entirely.

Change-Id: I09a7dedaedf5b527f010f0197235d8116a68c30f
mondrianwifi: msm_rq_stats: Tone down mpdecision

Add a new Kconfig to enable more conservative computations sent
to mpdecision:

 * Do not make IO busy
 * Do a time window weighted load computation instead of just a sum
 * Do an sliding window averaged time computation for number runnable

The purpose of these changes is to make mpdecision less likely to
keep extra cores online.  It currently has a tendancy to run more
cores running than needed and this can even cause some lag issues.

Change-Id: Ibbe9dca04c8b3425e288afef9ef6166fbc4a0613
tabpro: defconfig: Enable new rq_stats computation

Change-Id: I51db95c3f3c7f5f02d051d1db3c04a507f73883e