wpa_supplicant(hidl): Send the active bssid on state change

wpa_supplicant uses different bssid field to indicate the active BSSID
before association & after. So, send the respective ones in the HIDL
callback.

Bug: 36451639
Test: Compiles & manual tests
Change-Id: I063bd0dff5c27efdd22cad4b8908ef27f4efce04
1 file changed