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RS485 is not possible without an RTS GPIO regardless of whether RS485 is
enabled at boot time or not. So correct the concerning check in the probe()
function.

Fixes: e849145e

 ("serial: ar933x: Fill in rs485_supported")
Signed-off-by: Lino Sanfilippo <l.sanfilippo@kunbus.com>
Link: https://lore.kernel.org/r/20220710164442.2958979-2-LinoSanfilippo@gmx.de

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>