Integrate gf-emc-test-suite/rs485echo_fix_transmission_behavior

Commit: seco-ne/tools/gf-emc-test-suite@113135af

rs485echo: Fix RS485 transmission delays

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

Source merge request: seco-ne/tools/gf-emc-test-suite!65 (merged)

mentioned in merge request seco-ne/tools/gf-emc-test-suite!65 (merged)

merged