Added check if the device address is random

A check if the device address is random is needed since in a
public device address the two most significatant bits can also be
equal to 01 (see Bluetooth specification Core_v4.1.pdf, page 2021
and page 2500).

Bug: 18784040
Change-Id: I4f967a426ebb825731461e202c0741ae0540ef6a