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

This reverts commit 0f64f66eb940c0fac853d5c516c3c1abbce374b8.
Revert "cypress-touchkey : add sysfs interface to enable/disable lighting hardwarekey backlight on screen touch (Yank555.lu)"

This reverts commit 1e9587aadc49eb5d1388980757eff4f4195f1f86.
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