boards native: Add extra arguments through kconfig

Add a new way of passing extra command line arguments
to native simulator based boards using kconfig.
If this new kconfig option is set, its content will be treated
as extra command line arguments/options which will
be parsed before the other command line options.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
8 files changed