lcdfreq.c: Update capability for CPU frequency based LCD freq scaling

Minor updates from Zanezam
https://github.com/zanezam/boeffla-kernel-jb-u10up-s3/commit/6fbd31c48fac134a578ad292643da9104b666fa1

Credit: AndreiLux
smdk4412: Notification LED controls

Change-Id: Ic20c4946d4ea2336e1fa844d6600469e3517752d