input: Add option to disable touch booster

 * This can also be done from userspace, so allow disabling it.

Conflicts:
	drivers/input/keyboard/gpio_keys.c
	drivers/input/touchscreen/rmi_fw_update.c
	drivers/input/touchscreen/synaptics_i2c_rmi.h
	include/linux/gpio_keys.h
	include/linux/i2c/cypress_touchkey.h
	include/linux/i2c/mxts.h

Change-Id: I08842e5ba1e6d8f84887ab6a5b47ceed0e6d91a0
cm: Disable DVFS touch booster

* We do this from userspace via boostpulse.

Change-Id: I15fef5d6b2f03c5049921ef800f854eb83b27b4f