wifi: remove wifi instance name string check

When wifi instance name is empty, HAL should still be started normally.

Bug: 161951052
Test: atest VtsHalWifiV1_0TargetTest VtsHalWifiNanV1_0TargetTest VtsHalWifiApV1_0TargetTest \
            VtsHalWifiV1_1TargetTest \
            VtsHalWifiV1_2TargetTest VtsHalWifiNanV1_2TargetTest \
            VtsHalWifiV1_3TargetTest \
            VtsHalWifiApV1_4TargetTest VtsHalWifiNanV1_4TargetTest VtsHalWifiRttV1_4TargetTest
Change-Id: I2d848501ba3e7d4128b07d8ac858e5ebd31c6452
diff --git a/wifi/supplicant/1.0/vts/functional/supplicant_hidl_test_utils.cpp b/wifi/supplicant/1.0/vts/functional/supplicant_hidl_test_utils.cpp
index 5e7a371..a44298a 100644
--- a/wifi/supplicant/1.0/vts/functional/supplicant_hidl_test_utils.cpp
+++ b/wifi/supplicant/1.0/vts/functional/supplicant_hidl_test_utils.cpp
@@ -52,10 +52,6 @@
 // Helper function to initialize the driver and firmware to STA mode
 // using the vendor HAL HIDL interface.
 void initilializeDriverAndFirmware(const std::string& wifi_instance_name) {
-    // Skip if wifi instance is not set.
-    if (wifi_instance_name == "") {
-        return;
-    }
     if (getWifi(wifi_instance_name) != nullptr) {
         sp<IWifiChip> wifi_chip = getWifiChip(wifi_instance_name);
         ChipModeId mode_id;
@@ -69,10 +65,6 @@
 // Helper function to deinitialize the driver and firmware
 // using the vendor HAL HIDL interface.
 void deInitilializeDriverAndFirmware(const std::string& wifi_instance_name) {
-    // Skip if wifi instance is not set.
-    if (wifi_instance_name == "") {
-        return;
-    }
     if (getWifi(wifi_instance_name) != nullptr) {
         stopWifi(wifi_instance_name);
     } else {