RTEMS | Complete the u-boot support for qoriq_e500 (#5488)

[Gedare Bloom (@gedare)]

Gedare Bloom created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5488



## Summary
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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.

## Steps to reproduce
- Add the .yml file under spec so that HAS_UBOOT can be defined in config.ini
- Add uboot_support.c to define the u-boot environment base address and size

## Expected behaviour

User can have "HAS_UBOOT = True" in config.ini when building RTEMS, and then use bsp_uboot_getenv in applications to access the u-boot environment variables.

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powerpc, qoriq

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5488
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