Currently, MAC address update is supported only when interface is down.
Because of this framework needs to issue interface down and interface
up to update the MAC address.
This is resulting in connection time increase when MAC address
randomization is enabled for every new connection.
To optimize the connection time, add support to update the MAC address
without bringing the interface to down state.
Change-Id: Ic3eff6a9571f885292021b2c178d26b0eace5042
CRs-Fixed: 3063475
ca4b3fabf6