MEDIUM: ssl: add FIPS TLS 1.2 cipher check for AWS-LC

MEDIUM: ssl: add FIPS TLS 1.2 cipher check for AWS-LC

Add ssl_fips_check_ciphers() to check the cipher list already loaded
into an SSL_CTX against the FIPS-approved bulk cipher NID allowlist
(AES-128-GCM, AES-256-GCM).  The check is run unconditionally after
SSL_CTX_set_cipher_list() for both bind and server contexts.

The function reuses the fips_obj_info() helper introduced with the
version check to emit precise 'type proxy/name [file:line]' error
messages and returns ERR_ALERT|ERR_ABORT|ERR_FATAL on violation.