RTEMS | spec/build: No AArch64 BSP can disable the data cache (#5721)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5721



`ts-validation-cache` terminates with
`INTERNAL_ERROR_CANNOT_DISABLE_DATA_CACHE` on every AArch64 BSP except
`xilinx-zynqmp`. `_CPU_cache_disable_data()` of
`bsps/aarch64/shared/cache/cache.c` raises that fatal error, and all nine
AArch64 BSP families compile that file. The build picks the test case which
expects the directive to work by naming two BSP families, so the condition
misses the other eight AArch64 families.

Found while running the full test suite on eleven simulators. This description
was created with Claude Code assistance.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5721
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