hammerhead kernel: implement always on rgb led support

When offms is set to 0, configure a single point
duty cycle at the desired led brightness.

Change-Id: I93b61af52ee2f695035e7f5d78814251c8d1da8d
leds: At disable, set the trigger to default instead of wiping it

Change-Id: Ifb4a3b3034c441d29fd1d9f209ed829adfc76a72
Yank555.lu v1.1-beta3 config
ramfs: use Slim-hammerhead-5.0.alpha.0.5-UNOFFICIAL-20141128-2038 ramfs
Yank555.lu v1.1 config