drivers: ethernet: stm32: Disable autonegation for new api

As it is not supported

Signed-off-by: Bjarne von Horn <B.von_horn@wzl.rwth-aachen.de>
diff --git a/drivers/ethernet/eth_stm32_hal.c b/drivers/ethernet/eth_stm32_hal.c
index b9c2b47..1faab97 100644
--- a/drivers/ethernet/eth_stm32_hal.c
+++ b/drivers/ethernet/eth_stm32_hal.c
@@ -1111,7 +1111,7 @@
 	.heth = {
 		.Instance = (ETH_TypeDef *)DT_INST_REG_ADDR(0),
 		.Init = {
-#if !defined(CONFIG_SOC_SERIES_STM32H7X)
+#if !defined(CONFIG_SOC_SERIES_STM32H7X) && !defined(CONFIG_ETH_STM32_HAL_API_V2)
 #if defined(CONFIG_ETH_STM32_AUTO_NEGOTIATION_ENABLE)
 			.AutoNegotiation = ETH_AUTONEGOTIATION_ENABLE,
 #else