RTEMS | cpukit/rtems-fdt: Fix rtems_fdt_prop_map size limitation (!1337)

[saksham balsane (@sak8644)]

saksham balsane created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1337

Project:Branches: sak8644/rtems:fix-fdt-prop-map to rtems/rtos/rtems:main
Author:   saksham balsane



## Summary

cpukit/rtems-fdt: Fix rtems_fdt_prop_map size limitation

Introduce `rtems_fdt_prop_map_uint32()` and `rtems_fdt_prop_map_uint64()` to safely map strict property sizes without architecture dependencies. Modify the legacy `rtems_fdt_prop_map()` to be rigid on sizing to prevent arbitrary variable-length properties (like strings) from succeeding. Update API documentation.

Closes #5602.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1337
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