RTEMS | aarch64/raspberrypi: improve UART (!234)

[Ning Yang (@yangn0)]

Ning Yang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/234

Project:Branches: yangn0/rtems:rpi-uart to rtems/rtos/rtems:main
Author:   Ning Yang




## 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

Co-authored-by: Ning Yang <yangn0 at qq.com>


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