Generate random mac for BT; fix executions of geomagneticd/orientationd

Change-Id: I72aa17a94944bd9cb5e48437e04c03155a73fc0d
bt: fix mac address, dont use random - use last 3 octets from wifi mac in reverse order

Change-Id: I67f3127bac9d42c8817598707076d232edd1ffc8