Add wifi_add_or_remove_virtual_intf() to the legacy wifi hal

This is used to implement add/remove virtual interfaces for legacy
wifi drivers at runtime.

Change-Id: I5e95fcc350b2e000dab8843d91423235d4310f03
CRs-Fixed: 2257197
diff --git a/include/hardware_legacy/wifi_hal.h b/include/hardware_legacy/wifi_hal.h
index 5dabeb6..7b1f418 100644
--- a/include/hardware_legacy/wifi_hal.h
+++ b/include/hardware_legacy/wifi_hal.h
@@ -553,6 +553,9 @@
                                                 wifi_interface_type iface_type);
     wifi_error (*wifi_virtual_interface_delete)(wifi_handle handle, const char* ifname);
 
+    wifi_error (*wifi_add_or_remove_virtual_intf)(wifi_interface_handle iface,
+                                                  const char* ifname, u32 iface_type,
+                                                  bool create);
 } wifi_hal_fn;
 wifi_error init_wifi_vendor_hal_func_table(wifi_hal_fn *fn);
 #ifdef __cplusplus