RTEMS | shared/u-boot: Cleanup unused function (!1359)

[Vijay Banerjee (@vijay)]

Vijay Banerjee created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1359

Project:Branches: vijay/rtems:uboot_undef_issue to rtems/rtos/rtems:main
Author:   Vijay Banerjee



## Summary

shared/u-boot: Cleanup unused function

This commit adds 'HAS_UBOOT' conditional to 'bsp_uboot_getenv' to match
the bsp.h file.

This fixes the following errors:
     error: home/tester/bsps/powerpc/shared/u-boot/uboot_getenv.c:73:13:
            error: no previous prototype for 'bsp_uboot_getenv'
            [-Werror=missing-prototypes]

Updates #5481


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1359
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