RTEMS | BSP Improvements for RPi4 (&6)

[Ning Yang (@yangn0)]

Ning Yang commented: https://gitlab.rtems.org/groups/rtems/-/epics/6#note_110267


Coding Period Week #12

Planned:
- SD R/W access support.
  - mailbox driver

Completed:
1. Improved Watchdog MR. rtems/rtos/rtems!120 
2. Improved pl011 MR. rtems/rtos/rtems!47 
3. Imporved SPI MR. rtems/rtos/rtems!103 
4. Try running Barusu's mailbox driver.
https://github.com/UtkarshVerma/rtems-on-rpi4b/blob/main/hardware-info/src/init.c
read his blog: https://bitbanged.com/posts/understanding-rpi/the-mailbox/

Blockers/Problems:
- Barusu said:
```
Mailbox was a hard nut to crack and I remember that Joel and the others mentioned that the API I developed needed some design improvements, so you'll have to get creative here and have discussions with everyone on the design. 
```
So, I will try to improve it after I figure out the existing mailbox code.

Next week plans:
- SD R/W access support.
  - mailbox driver

-- 
View it on GitLab: https://gitlab.rtems.org/groups/rtems/-/epics/6#note_110267
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