RTEMS | rtems-fdt: rtems_fdt_get_value() does not work as expected (#5600)

[Gedare Bloom (@gedare)]

Gedare Bloom created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5600



## Summary
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The rtems_fdt_get_value() is sparsely documented, but it claims to "Get a value given a path and a property." However, it will only get a property value if the property size matches the `uintptr_t` size. This greatly limits the usefulness of the API call and it will give different behavior under 32- and 64-bit pointer sizes.

I would change this API to replace the `uintptr_t *value` with `void *value` and use memcpy() to populate it, similar to what is done in `rtems_fdt_prop_value`.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5600
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