OmniGears: correct enablement of custom button binding sections

What a derp

Change-Id: Id75318c2caad64993304a0896019bd8b72de3e45
OmniGears: support for devices without notification LED configs

Hide useless options for devices that only have a single color
led and also dont allow changing the blinking frequency
e.g. find7

Change-Id: Id87dd7a0caf802c6ee0817b0b937cb0c1d94252e
Merge remote-tracking branch 'omnirom/android-4.4' into Kitkat