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Add the serdev (UART) transport for the Realtek PSE MCU core. It registers the MCU as a serdev device and provides the send/recv callbacks the core uses to exchange the 12-byte frames, receiving asynchronously via the serdev receive_buf callback. The baud rate defaults to 19200 and can be overridden per board with the "current-speed" property. Signed-off-by: Jonas Jelonek <[email protected]> Reviewed-by: Kory Maincent <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Paolo Abeni <[email protected]>