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

Change-Id: Ifb4a3b3034c441d29fd1d9f209ed829adfc76a72
msm: mdss: Find a stable sysfs node for the gamma interface

Move sysfs files to /sys/module/dsi_panel/*

Change-Id: I212a5e0903958127094c71a9f7c6280efc76cf29
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>