cpufreq: add input-cfboost

Add a module which can be used alongside any cpufreq governor to
temporarily raise CPU frequency upon input events.

Change-Id: Id0c69e5c7194c0e27ec176787cdc076b461d749e
Signed-off-by: Michal Pecio <mpecio@nvidia.com>
Reviewed-on: http://git-master/r/122180
Reviewed-by: Satya Popuri <spopuri@nvidia.com>
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>