Revert "[STM32 NUCLEO] Init MAC address"

Author: sg-

features/net/FEATURE_IPV4/lwip-interface/lwip-eth/arch/TARGET_STM/stm32xx_emac.c

@@ -431,31 +431,3 @@ void eth_arch_disable_interrupts(void)
 {
     NVIC_DisableIRQ(ETH_IRQn);
 }
-
-/** This returns a unique 6-byte MAC address, based on the device UID
-*  This function overrides hal/common/mbed_interface.c function
-*  @param mac A 6-byte array to write the MAC address
-*/
-void mbed_mac_address(char *mac) {
-    unsigned char ST_mac_addr[3] = {0x00, 0x80, 0xe1}; // default STMicro mac address
-
-    // Read unic id
-#if defined (TARGET_STM32F2)
-    uint32_t word0 = *(uint32_t *)0x1FFF7A10;
-#elif defined (TARGET_STM32F4)
-    uint32_t word0 = *(uint32_t *)0x1FFF7A10;
-#elif defined (TARGET_STM32F7)
-    uint32_t word0 = *(uint32_t *)0x1FF0F420;
-#else
-    #error MAC address can not be derived from target unique Id
-#endif
-
-    mac[0] = ST_mac_addr[0];
-    mac[1] = ST_mac_addr[1];
-    mac[2] = ST_mac_addr[2];
-    mac[3] = (word0 & 0x00ff0000) >> 16;
-    mac[4] = (word0 & 0x0000ff00) >> 8;
-    mac[5] = (word0 & 0x000000ff);
-
-    return;
-}