bladeparts: use uniform title between devices

*Use "Advanced settings" for all DeviceParts
*Use /sys/class path for button backlight

Change-Id: I7b739da1ae301916a03e43841d7de8663a5400c9
liblights: cleanup

Change-Id: I2603ee6c94470fb8f2bc1d3b19fe02e5b4eaea0d
update readme

Change-Id: I52656875ce5dbfcaa60f628439f072711cb44ecc