RTEMS | Complete the u-boot support for qoriq BSP (!1046)

[Ran Hong (@hongran86)]

Ran Hong created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1046

Project:Branches: hongran86/rtems:main to rtems/rtos/rtems:main
Author:   Ran Hong



## Summary

The u-boot support for powerpc/qoriq is not complete. Under bsps/powerpc/qoriq/include/bsp.h, bsp_uboot_getenv is declared if HAS_UBOOT is defined. However, in HAS_UBOOT is not configurable through waf and variables needed by bsp_uboot_getenv are not defined for qoriq.

- Added the .yml files under spec so that HAS_UBOOT can be defined in config.ini
- Updated .yml files for the added build dependencies
- Added uboot_support.c to define the u-boot environment base address and size
- The default address and size of the u-boot environment is based on the mvme2500 board's MRAM, which can be configured to hold u-boot environment.


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