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rs485echo: Fix RS485 transmission delays

Felix Gerking requested to merge rs485echo_fix_transmission_behavior into dunfell

Before, the delay_rts_before_send delay_rts_after_send fields were not explicitly initialized. This led to a erroneous transmission behaviour. Now the RS485 port settings are read before the half duplex configuration is done. This ensures that the delays are set to 0 or to a predefined value (device tree).

BCS 746-000908

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