Integrate linux-seco-rk/ap/c31-fix-rs485-emulation

Commit: https://git.seco.com/edgehog/bsp/rockchip/linux-seco-rk/-/commit/fcba9f188cb6fc64cfddf09003b76abb9e64f709

[C31][DTS] use already-existing properties to setup rs485 emulation

Adapt the dts to 17b69de6326518bfbfba3fcb224d3af3dbe87944

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Commit: https://git.seco.com/edgehog/bsp/rockchip/linux-seco-rk/-/commit/17b69de6326518bfbfba3fcb224d3af3dbe87944

[DRIVER] revert "add rs485 support" and "improve rs485 management"

This reverts commits:

• 370b65050a6d1441fd58c53f50807ff06302fd8f
• 24f0ec10e1826f74d921d85cde0b53907415eb23

Support for rs485 control signals has already been added to this driver in 8498826faeeaa67eba77ec7f7781adca87d6de45.