RP2040: fix OTA and binary size computation #1172

Job	Run time
compile-examples (arduino:mbed:nano33ble)	7m 43s
compile-examples (arduino:mbed:envie_m7)	17m 14s
compile-examples (arduino:mbed:nanorp2040connect)	13m 38s
compile-examples (arduino:mbed:nicla_sense)	13m 30s
compile-examples (arduino:mbed:nicla_vision)	11m 49s
compile-examples (arduino:mbed:opta)	15m 56s
compile-examples (arduino:mbed:giga)	24m 28s
compile-examples (arduino:mbed:nicla_voice)	5m 23s
compile-examples (arduino:mbed:edge_control)	6m 0s
compile-examples (arduino:mbed:envie_m7:target_core=cm4, - libraries/KernelDebug - libraries/Port...	4m 35s
	2h 0m 16s

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