Revert^2 "Change ifname to interface handle in set_scan_mode api"

This reverts commit 3a4e5591c0d77abdd0d7e732d735ec352265dbd7.

Reason for revert: Fix for build failure identified

Change-Id: I1f7784f67b575103bb5a6f3ce77fb9551f1f1471
diff --git a/wifi/aidl/default/wifi_legacy_hal.cpp b/wifi/aidl/default/wifi_legacy_hal.cpp
index cf86120..bd92a20 100644
--- a/wifi/aidl/default/wifi_legacy_hal.cpp
+++ b/wifi/aidl/default/wifi_legacy_hal.cpp
@@ -2012,7 +2012,7 @@
 }
 
 wifi_error WifiLegacyHal::setScanMode(const std::string& iface_name, bool enable) {
-    return global_func_table_.wifi_set_scan_mode(iface_name.c_str(), enable);
+    return global_func_table_.wifi_set_scan_mode(getIfaceHandle(iface_name), enable);
 }
 
 wifi_error WifiLegacyHal::setDtimConfig(const std::string& iface_name, uint32_t multiplier) {
diff --git a/wifi/legacy_headers/include/hardware_legacy/wifi_hal.h b/wifi/legacy_headers/include/hardware_legacy/wifi_hal.h
index e770777..4262913 100644
--- a/wifi/legacy_headers/include/hardware_legacy/wifi_hal.h
+++ b/wifi/legacy_headers/include/hardware_legacy/wifi_hal.h
@@ -1386,7 +1386,7 @@
      * @param enable true if current is scan only mode
      * @return Synchronous wifi_error
      */
-    wifi_error (*wifi_set_scan_mode)(const char * ifname, bool enable);
+    wifi_error (*wifi_set_scan_mode)(wifi_interface_handle iface, bool enable);
 
     wifi_error (*wifi_nan_pairing_end)(transaction_id id,
                                     wifi_interface_handle iface,