RTEMS | bsps/arm/realview-pbx-a9: Fix PL111 MMU mapping (!1139)

[Cibi P (@cibi_p)]

Cibi P created a merge request: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1139

Project:Branches: cibi_p/rtems:fix-pl111-mmu-mapping to rtems/rtos/rtems:main
Author:   Cibi P



## Summary

bsps/arm/realview-pbx-a9: Fix PL111 MMU mapping

The PL111 registers at 0x10020000 were not included in the initial MMU device 
section. This caused a fatal source exception during the framebuffer 
initialization.

Update the mapping to include the PL111 region.

The images below are taken from the `RealView Platform Baseboard Explore for 
Cortex-A9 User Guide`

![image.png](/uploads/54810b37e738dbf3bf2e6eddfa48a13c/image.png){width="745" 
height="600"}

![image.png](/uploads/c3bc4199226ecb42ebef58ccf05ec044/image.png){width="745" 
height="600"}

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View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1139
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