[TF-A] [TF-A]: Deprecating mbedtls-2.28 support for TF-A 3.0 release

Hi All,

We are in the process of migrating from mbedtls-2.28 support to 3.3 support we plan to deprecate mbedtls-2.28 support for TF-A 3.0 Release but would retain support for both 2.28 and 3.3 for TF-A 2.9 lifetime.

There is draft implementation available[1] for code review which cleanups and prepares for mbedtls-3.3 support but retaining backward compatibility for mbedtls-2.28.

Please let us know if there any objections to deprecation of mbedtls-2.28 in TF-A 3.0.

-- Thanks Govindraj

[1]: https://review.trustedfirmware.org/q/topic:%2522mbedtls3.3_support%2522 https://review.trustedfirmware.org/q/topic:%2522mbedtls3.3_support%2522