RTEMS | bsps/*acpi*: Address unterminated string warnings (!734)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/734

Project:Branches: joel/rtems:fix-unterminated-strings-warning to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill
Reviewers: Kinsey Moore and Gedare Bloom


## Summary

bsps/*acpi*: Address unterminated string warnings

The ACPI source has multiple tables where a Name field is defined.
The name field is a character array with a length of 4. All of the
string initializers are four characters plus a NUL. The code is
careful to use strn*() functions and intentionally avoids assuming
there is space for the NUL. With lots of entries in the various
arrays, this was clearly a design decision to save space.

This was caught by GCC's -Wunterminated-string-initialization
warning. The solution used is to use the "nonstring" attribute
recommended by the GCC manual.

Closes #5329


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