Add missing define guards

Author: mkardous-silabs

src/platform/silabs/wifi/SiWx/WifiInterfaceImpl.cpp

@@ -489,8 +489,10 @@ void WiseconnectWifiInterface::MatterWifiTask(void * arg)
     VerifyOrReturn(status == SL_STATUS_OK,
                    ChipLogError(DeviceLayer, "MatterWifiTask: SiWxPlatformInit failed: 0x%lx", static_cast<uint32_t>(status)));
 
+#if CHIP_CONFIG_ENABLE_ICD_SERVER
     // Remove High performance request after the device is initialized
     chip::DeviceLayer::Silabs::WifiSleepManager::GetInstance().RemoveHighPerformanceRequest();
+#endif // CHIP_CONFIG_ENABLE_ICD_SERVER
 
     WifiInterfaceImpl::GetInstance().NotifyWifiTaskInitialized();
 
@@ -512,8 +514,10 @@ CHIP_ERROR WifiInterfaceImpl::InitWiFiStack(void)
 {
     sl_status_t status = SL_STATUS_OK;
 
+#if CHIP_CONFIG_ENABLE_ICD_SERVER
     // Force the device to high performance mode during the init sequence.
     chip::DeviceLayer::Silabs::WifiSleepManager::GetInstance().RequestHighPerformanceWithoutTransition();
+#endif // CHIP_CONFIG_ENABLE_ICD_SERVER
 
     status = sl_net_init(SL_NET_WIFI_CLIENT_INTERFACE, &config, &wifi_client_context, nullptr);
     VerifyOrReturnError(status == SL_STATUS_OK, CHIP_ERROR_INTERNAL, ChipLogError(DeviceLayer, "sl_net_init failed: %lx", status));