Remove use of mbedtls_cipher_info from ssl_context_info.c

[davidhorstmann-arm]

Part of implementing #9904

Modify ssl_context_info.c to remove the use of mbedtls_cipher_ functions (these are used to get the name of the cipher being used).

Either:

• Find out how to replace this with equivalent code that gets the name of the ciphersuite in a way that does not use the legacy API, or
• Remove the pretty-printing of the cipher name and simply print a numerical value that represents the cipher being used. This already happens when MBEDTLS_CIPHER_C is not configured, but it needs some investigation to check that this is still the same when we are using PSA.

This task is done when ssl_context_info.c does not use any mbedtls_cipher functions (or for that matter any legacy crypto functions).

Estimate: 4 Ideal Engineering Hours