Fix missing-prototype errors in tests/suites

tests/src/test_helpers/ssl_helpers.c

tests/suites/test_suite_debug.function

tests/suites/test_suite_pkcs7.function

tests/suites/test_suite_x509parse.function

tests/suites/test_suite_x509write.function

tf-psa-crypto/tests/suites/host_test.function

tf-psa-crypto/tests/suites/main_test.function

tf-psa-crypto/tests/suites/test_suite_alignment.function

tf-psa-crypto/tests/suites/test_suite_asn1parse.function

tf-psa-crypto/tests/suites/test_suite_asn1write.function

tf-psa-crypto/tests/suites/test_suite_bignum.function

tf-psa-crypto/tests/suites/test_suite_cipher.function

tf-psa-crypto/tests/suites/test_suite_common.function

tf-psa-crypto/tests/suites/test_suite_ctr_drbg.function

tf-psa-crypto/tests/suites/test_suite_dhm.function

tf-psa-crypto/tests/suites/test_suite_entropy.function

tf-psa-crypto/tests/suites/test_suite_lmots.function

tf-psa-crypto/tests/suites/test_suite_pk.function

tf-psa-crypto/tests/suites/test_suite_platform.function

tf-psa-crypto/tests/suites/test_suite_psa_crypto.function