Ethernet, initCallback, ctor and eth_if #1123

Job	Run time
compile-examples (arduino:mbed:nano33ble)	7m 42s
compile-examples (arduino:mbed:envie_m7)	17m 7s
compile-examples (arduino:mbed:nanorp2040connect)	13m 0s
compile-examples (arduino:mbed:nicla_sense)	7m 44s
compile-examples (arduino:mbed:nicla_vision)	12m 37s
compile-examples (arduino:mbed:opta)	16m 26s
compile-examples (arduino:mbed:giga)	24m 49s
compile-examples (arduino:mbed:nicla_voice)	5m 32s
compile-examples (arduino:mbed:edge_control)	6m 13s
compile-examples (arduino:mbed:envie_m7:target_core=cm4, - libraries/KernelDebug - libraries/Port...	4m 45s
	1h 55m 55s

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