When Connected MAC Randomization is enabled and the device is
disconnected, there isn't a valid MAC address to display since we don't
know what the device's next MAC address is going to be.
Instead of displaying the MAC address used for previous connection, tell
users that "MAC address is randomized."
Bug: 73663275
Test: make -j40 RunSettingsRoboTests
Change-Id: Id5352926f221e3215734d1c198f2072940f82695
The implementations have been imported into SettingsLib. Setting's copy
can now be removed, which this change also does.
Test: Manually check battery status, which uses FooterMixin, looks OK.
make RunSettingsLibRobotTests && make RunSettingsRoboTests
&& make RunSettingsGoogleRoboTests
Change-Id: I6539605fdad80d156ff5ff249e68df4a1c412067
