boards: stm32: fix --reset argument for stm32cubeprogrammer runner

stm32cubeprogrammer runner takes a --reset-mode argument to specify the
type of reset used in the flashing process.
Though, argparse default configuration in python allows shortened command
arguments and it happened that --reset was used on most boards instead
of --reset-mode.
This argparse configuration is being changed in order to prevent shortened
command  args (see #53495). As a consequence all board configs using
--reset should be updated to use the full length version.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>