The limit is set by a `MICROPY_PY_MACHINE_FREQ_NUM_ARGS_MAX` define, which
defaults to 1 and is set for stm32 to 4.
For stm32 this fixes a regression introduced in commit
e1ec6af654b1c5c4a973b6c6b029ee68bb92eb89 where the maximum number of
arguments was changed from 4 to 1.
Signed-off-by: robert-hh <robert@hammelrath.com>