serial: omap-serial: Use common rs485 device tree parsing function
We just got a common helper for parsing the rs485 specific device tree properties. Use it and drop the open coded parser. Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de> Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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