leds: At disable, set the trigger to default instead of wiping it

Change-Id: Ifb4a3b3034c441d29fd1d9f209ed829adfc76a72
Merge "leds: At disable, set the trigger to default instead of wiping it" into kk4.4
Merge branch 'kk4.4' of https://github.com/SlimRoms/kernel_lge_hammerhead into kitkat