liblights: set LED state in base of flashMode

Fix also LED notifications for some apps.
latona: use EGL context_priority extension

Hibernation is not supported.
liblights: ignore LIGHT_ID_ATTENTION

It's causing some issues with some apps and it's not required.
Merge branch 'jellybean' of git://github.com/sconosciuto/android_device_samsung_galaxysl into jellybean