Revert "cypress-touchkey : add sysfs interface to enable/disable lighting hardwarekey backlight on screen touch (Yank555.lu)"

This reverts commit 87b7d7b7e522d8cf52eab1f6d27946c920c24a96.
Revert "cypress-touchkey : add sysfs interface to enable/disable lighting hardwarekey backlight on screen touch (Yank555.lu)"

This reverts commit f827bf2f60f98ad767fc8a973d9be1c312c14d81.
cypress-touchkey: remove backlight timeout feature

Userspace implementation:
http://review.cyanogenmod.org/48796
http://review.cyanogenmod.org/48872
http://review.cyanogenmod.org/48884

Change-Id: Id4ac50168220310e82aa4aae367dad4e72e3a9c3

Conflicts:

	drivers/input/keyboard/cypress/cypress-touchkey.c
	drivers/input/touchscreen/mms_ts.c