drivers: ethernet: stm32: Set LAA bit on MAC address based on device ID

The MAC addressed derived from the device ID is not assigned by the
manufacturer and therefor the Locally Administered Address (LAA) bit should
be set.

Signed-off-by: Pieter De Gendt <[email protected]>
(cherry picked from commit 300016c)

Author: pdgendt

drivers/ethernet/eth_stm32_hal.c

@@ -815,6 +815,12 @@ static void generate_mac(uint8_t *mac_addr)
 	result_mac_32_bits = crc32_ieee((uint8_t *)unique_device_ID_12_bytes, 12);
 	memcpy(&mac_addr[3], &result_mac_32_bits, 3);
 
+	/**
+	 * Set MAC address locally administered bit (LAA) as this is not assigned by the
+	 * manufacturer
+	 */
+	mac_addr[0] |= 0x02;
+
 #endif /* NODE_HAS_VALID_MAC_ADDR(DT_DRV_INST(0))) */
 #endif
 }