[Development] Fix GCC 15 warning 'Wunterminated-string-initialization'

[felixc-arm]

mbedtls development part of https://github.com/Mbed-TLS/mbedtls/issues/9944 Depends on https://github.com/Mbed-TLS/TF-PSA-Crypto/pull/313

Merge order (for development/1.0/4.0) is as follows: Merge the TF-PSA-Crypto PR https://github.com/Mbed-TLS/TF-PSA-Crypto/pull/313 Update the tf-psa-crypto submodule for the this PR to the merge commit of the TF-PSA-Crypto PR Merge this PR

Once these two PRs are merged, plus the 3.6 mbedtls PR (https://github.com/Mbed-TLS/mbedtls/pull/10215), then the framework PR (https://github.com/Mbed-TLS/mbedtls-framework/pull/173) can be merged.

PR checklist

• [ ] changelog not required because: non-functional build change to be fixed in 3.6.x
• [ ] development PR provided: HERE
• [ ] TF-PSA-Crypto PR provided: https://github.com/Mbed-TLS/TF-PSA-Crypto/pull/313
• [ ] framework PR provided: https://github.com/Mbed-TLS/mbedtls-framework/pull/173
• [ ] 3.6 PR provided: https://github.com/Mbed-TLS/mbedtls/pull/10215
• tests not required because: build only change