serial: exar: Factor out platform hooks
This prepares the addition of IOT2040 platform support by preparing the needed setup and rs485_config hooks. Signed-off-by:Jan Kiszka <jan.kiszka@siemens.com> Reviewed-by:
Andy Shevchenko <andy.shevchenko@gmail.com> Acked-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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