blu_plug: improve screen off/on functions

* Better performance and use msm methods
* Improved battery with 1 core on screenoff
* Compatible with lollipop Battery saver (set is on/off, screen off/on to activate/deactivate)

Signed-off-by: engstk <eng.stk@sapo.pt>
blu_active: use chose_freq from CM interactive

Signed-off-by: engstk <eng.stk@sapo.pt>