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.

Issue: FP2P-100
Change-Id: I5e95fcc350b2e000dab8843d91423235d4310f03
CRs-Fixed: 2257197
(cherry picked from commit 29550bf66ff636df0f84f9a0eb45d29f8a096fd3)
diff --git a/include/hardware_legacy/wifi_hal.h b/include/hardware_legacy/wifi_hal.h
index cdf6b48..71f7a3e 100644
--- a/include/hardware_legacy/wifi_hal.h
+++ b/include/hardware_legacy/wifi_hal.h
@@ -464,6 +464,9 @@
                                          wifi_roaming_config *roaming_config);
     wifi_error (*wifi_set_radio_mode_change_handler)(wifi_request_id id, wifi_interface_handle
                         iface, wifi_radio_mode_change_handler eh);
+    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