Revert "cypress-touchkey: remove backlight timeout feature"

This reverts commit a64df5bd240324b9551cffbf9171888ccaa3fdeb.
Revert "isa1200: move sysfs node for pwm level"

This reverts commit 9c135abddcf1b3f7a30104d7171c9488f63881f9.
Revert "max8997: move sysfs node for pwm level"

This reverts commit a8583839d9318fb5601b80769fc45d358a56faf0.