SocketHelpers: fix macAddress(uint8_t* mac) reversed order #131

Job	Run time
compile-examples (arduino:mbed:nano33ble, nano33ble)	7m 41s
compile-examples (arduino:mbed:envie_m7, envie_m7)	16m 34s
compile-examples (arduino:mbed:envie_m7:target_core=cm4, envie_m7_core_cm4)	4m 31s
compile-examples (arduino:mbed:nanorp2040connect, nanorp2040connect)	13m 49s
compile-examples (arduino:mbed:nicla_sense, nicla_sense)	13m 47s
compile-examples (arduino:mbed:nicla_vision, nicla_vision)	10m 0s
compile-examples (arduino:mbed:opta, opta)	15m 10s
compile-examples (arduino:mbed:giga, giga)	23m 17s
compile-examples (arduino:mbed:nicla_voice, nicla_voice)	5m 51s
compile-examples (arduino:mbed:edge_control, edge_control)	5m 54s
	1h 56m 34s

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