wifi: Move legacy hal types to a new namespace (2/2)

Changes in HIDL interface obejcts to use the new namespace for legacy
HAL.

Bug: 32242225
Test: Compiles
Change-Id: I7d0e9cee8656bd779a24d9eaede415317dceaf9b
diff --git a/wifi/1.0/default/wifi.h b/wifi/1.0/default/wifi.h
index c682116..7872303 100644
--- a/wifi/1.0/default/wifi.h
+++ b/wifi/1.0/default/wifi.h
@@ -64,7 +64,7 @@
 
   // Instance is created in this root level |IWifi| HIDL interface object
   // and shared with all the child HIDL interface objects.
-  std::shared_ptr<WifiLegacyHal> legacy_hal_;
+  std::shared_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
   RunState run_state_;
   std::vector<sp<IWifiEventCallback>> event_callbacks_;
   sp<WifiChip> chip_;