Merged Full commit by VOKU! about touch screen freq changes.

+more/less freq while touching if more/less processes are running.
+set touch-freq from 100MHz to 1GHz,
limited by "TOUCH SCREEN LOCK FREQ"

Thnaks VOKU for nice idea!
Implemented Frequency Step to 50mhz from 100mhz to 1200mhz!
It should be consume less power..... :)
Seems very stable.... Need testing!
Merge remote-tracking branch 'dorimanx/master-jelly-bean' into master-3.0.y

Conflicts:
	drivers/input/touchscreen/mxt224_u1.c

+ ...