[hmac, TLT] Extend multistream top-level test for HMAC

[ballifatih]

Description

Spin-off from https://github.com/lowRISC/opentitan/pull/23494#pullrequestreview-2099019551, https://github.com/lowRISC/opentitan/pull/23494#discussion_r1626138082 and https://github.com/lowRISC/opentitan/pull/23471#issuecomment-2146104610

Current HMAC multistream TLT is about HMAC/SHA-2 streams that perform context switches in interleaving fashion. We would like to improve this test in order to have a better coverage:

• It would be nice to visit each test twice so that the same digest/key-size vectors also repeat each other.
• Mix between one-shot and streaming calls. In particular, having oneshot calls between streams could be interesting.
• Instead of dividing the input message into equal-sized two parts and making 2 update calls, consider feeding each message in [1, 4] update calls randomly.
• Randomize the order the tests are run.

Related to #22332

[vogelpi]

@ballifatih, based on the description of PR #23780, I think all the points raised above have been taken care of and we can close this issue. Do you agree? If not, can you please clarify what's missing? Thanks!

[ballifatih]

I only wanted to see few runs of the TLT before closing this. I just had a quick look at the last three runs of chip_sw_hmac_multistream and they were all passing. I am closing this issue.