Fake WifiDisplay address without location permission

The MAC address of WifiDisplays is now only visible to apps holding the
`android.Manifest.permission.ACCESS_FINE_LOCATION` permission when
calling `DisplayManagerService.getWifiDisplayStatus()`. Otherwise, the
device address is replaced with "00:00:00:00:00:00". Internal system
operations and broadcasts still use the full device address.

Bug: 242846520
Test: atest DisplayManagerServiceTest
Flag: EXEMPT simple bugfix
Change-Id: I01265c74d6c4200f82ad24196eb6fc19ee2e6c75