Use the last updated MAC address before turning on wifi
MAC randomization does not work properly when there are multiple wifi interfaces
or in some devices that do not create a .mac.info file.
So, to solve this problem, a permanent MAC address that is set before wifi up is used.
If a permanent MAC address is in built-in physical device,
it's hardly get it at an initial creation.
So, if there is a MAC address updated from netlink before wifi is on, it is used.
* MAC randomization works only when wifi is turned on.
Change-Id: Ia7a9ad0affaa6deca974199100a56e7378b6c195
Signed-off-by: Jaehyun Kim <jeik01.kim@samsung.com>