pta: veraison_attestation: integrate Veraison remote attestation PTA

Copy remote attestation PTA functionality from the repository:
https://github.com/iisec-suzaki/optee-ra (commit: 80ca8ef), and ma

pta: veraison_attestation: integrate Veraison remote attestation PTA

Copy remote attestation PTA functionality from the repository:
https://github.com/iisec-suzaki/optee-ra (commit: 80ca8ef), and make
the following adjustments for integration:

- Add build configuration for remote attestation PTA by introducing
the CFG_VERAISON_ATTESTATION_PTA option to align with the new naming
convention.
- Replace the custom base64 implementation with the base64 library
added in PR OP-TEE#7007.
- Update QCBOR integration by removing custom QCBOR files and using
the standard library, adjusting paths as necessary.
- Apply region validation improvements introduced in PR OP-TEE#6195.
- Update API calls in sign.c to align with libmbedtls changes from
PR OP-TEE#6151.
- Calculate the required buffer size at runtime to minimize memory
allocation.
- Refactor code to improve readability and maintainability.
- Add SPDX license identifier (BSD-2-Clause) and copyright notice.

Signed-off-by: Yuichi Sugiyama <yuichis@ricsec.co.jp>
Reviewed-by: Thomas Fossati <thomas.fossati@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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