This change enables the ULP (FSM) for all ESP32 variants rather than
requiring it to be enabled for each board specifically.
It also ensures the correct header file is included for each variant.
Lastly, it updates the IDF version we're builing against to v4.4.2, as that
version contains important fixes to make the ULP actually work on S2/S3
chips. See: https://github.com/espressif/esp-idf/commit/a0e3d48
Signed-off-by: Wilko Nienhaus <wilko.nienhaus@gmail.com>
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