wpa_supplicant(hidl): Turn on scan MAC randomization

Even though we moved scan handling to wificond, wpa_supplicant may
issue scans on its own in certain connection-related scenarios.
Ensure that we only use randomized scans in those cases on Android
devices.

Bug: 73642801
Test: Ensured that we can connect to wifi networks.
Test: Triggered scans via wpa_cli and ensured they use random MAC
addresses.

Change-Id: I95d0e021db7f4ec22ec13720f3a2de578e63f0a6
1 file changed