RTEMS | rtems-fdt: rtems_fdt_prop_map() property size limitation (#5602)

[Gedare Bloom (@gedare)]

Gedare Bloom created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5602



## Summary
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The `rtems_fdt_prop_map()` is only able to map properties whose lengths are less than or equal to the size of a pointer (`uintptr_t`). This is not documented in the API. This limitation also means that code that may work on a 64-bit architecture (lp64) may fail on a 32-bit (ilp32) one, if the property requested is 64-bits. It also means that the call could succeed/fail arbitrarily on variable-length properties (i.e., strings) if they happen to fit in the `uintptr_t` size.

I'm not sure if this is something we should document explicitly and leave as-is, or if we should make it more flexible, or perhaps more rigid.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5602
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