input: cypress: make Touchkey LED control configurable

CYPRESS_KEYLED_CONTROL could be used to control if the cypress
driver handles the key LEDs (1) or the control is granted to
the userspace (0)

Change-Id: I463cbddd4fc71dcb6944228ada4d069b7b12580a
Merge "input: cypress: make Touchkey LED control configurable" into android-4.4