wifi: fix incorrect active wlan iface in bridged mode

The hal use first active wlan iface to get chip info.
It should should return active wlan instance in bridged mode.

Bug: 162686273
Test: Manual test.
1. Wifi Off (SAA off), make sure bridged AP is first wlan iface
2. Enable bridged mode

Change-Id: Id5a3d5ab53c6ed34d5633be22ad56070f5f0d0e2