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aarch64/raspberrypi: improve UART

Ning Yang requested to merge yangn0/rtems:rpi-uart into main

Summary

aarch64/raspberrypi: improve UART

  • Add support for four new ports, UART2-UART5.
  • Add build options to allow console device configuration.
  • Segregate device-specific definitions from the device family files. X macros are used to maintain a single source of truth and have the configuration done at compile-time
  • Add raspberrypi_uart_init() to make it convenient for users to install uart devices

Close #5130 (closed)

Co-authored-by: Ning Yang yangn0@qq.com

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