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
diff --git a/wifi/1.5/default/wifi_chip.cpp b/wifi/1.5/default/wifi_chip.cpp
index a37fee2..80a48f5 100644
--- a/wifi/1.5/default/wifi_chip.cpp
+++ b/wifi/1.5/default/wifi_chip.cpp
@@ -1795,7 +1795,16 @@
 
 std::string WifiChip::getFirstActiveWlanIfaceName() {
     if (sta_ifaces_.size() > 0) return sta_ifaces_[0]->getName();
-    if (ap_ifaces_.size() > 0) return ap_ifaces_[0]->getName();
+    if (ap_ifaces_.size() > 0) {
+        // If the first active wlan iface is bridged iface.
+        // Return first instance name.
+        for (auto const& it : br_ifaces_ap_instances_) {
+            if (it.first == ap_ifaces_[0]->getName()) {
+                return it.second[0];
+            }
+        }
+        return ap_ifaces_[0]->getName();
+    }
     // This could happen if the chip call is made before any STA/AP
     // iface is created. Default to wlan0 for such cases.
     LOG(WARNING) << "No active wlan interfaces in use! Using default";