wifi(implementation): Move set/getMacaddress to a util class

This is just a refactor to move the setMacAddress & getFactoryMacAddress
methods to a util class within the HAL. This can be then reused in AP
iface for mac randomization of SoftAp.

This also fixes a bug in the existing setMacAddress() method, the
current method always sets wlan0 up/down. STA interface could be wlan1
on some devices.

Bug: 78353419
Test: ./hardware/interfaces/wifi/1.3/default/tests/runtests.sh
Test: Manually verified STA MAC randomization still works.
Change-Id: I0bb8154f7e6dcae37c977454423c8c299762260e
diff --git a/wifi/1.3/default/wifi.cpp b/wifi/1.3/default/wifi.cpp
index e3af1ea..1f64085 100644
--- a/wifi/1.3/default/wifi.cpp
+++ b/wifi/1.3/default/wifi.cpp
@@ -36,9 +36,11 @@
 Wifi::Wifi(
     const std::shared_ptr<legacy_hal::WifiLegacyHal> legacy_hal,
     const std::shared_ptr<mode_controller::WifiModeController> mode_controller,
+    const std::shared_ptr<iface_util::WifiIfaceUtil> iface_util,
     const std::shared_ptr<feature_flags::WifiFeatureFlags> feature_flags)
     : legacy_hal_(legacy_hal),
       mode_controller_(mode_controller),
+      iface_util_(iface_util),
       feature_flags_(feature_flags),
       run_state_(RunState::STOPPED) {}
 
@@ -105,7 +107,7 @@
     if (wifi_status.code == WifiStatusCode::SUCCESS) {
         // Create the chip instance once the HAL is started.
         chip_ = new WifiChip(kChipId, legacy_hal_, mode_controller_,
-                             feature_flags_);
+                             iface_util_, feature_flags_);
         run_state_ = RunState::STARTED;
         for (const auto& callback : event_cb_handler_.getCallbacks()) {
             if (!callback->onStart().isOk()) {