RTEMS | grlib/ambapp: Use correct member offset (!1502)

[Matteo Concas (@matteo.concas)]

Matteo Concas created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1502

Project:Branches: matteo.concas/rtems-gaisler:matteo/ambapp_offset to rtems/rtos/rtems:main
Author: Matteo Concas
Assignee: Matteo Concas

## Summary

grlib/ambapp: Use correct member offset

On 64-bit platforms, `struct ambapp_dev` is 36 bytes which get padded to 40
bytes.
In that scenario, substracting the size of the struct to get the address of the
parent struct yields incorrect results.

We instead use `RTEMS_CONTAINER_OF()` which will always give the correct parent
no matter the padding.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1502
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