Modifies tests in test_suite_ssl.function

Commit removes conditional compilation
code blocks relating to
MBEDTLS_SSL_TRUNCATED_HMAC config option.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index c555d74..e175db2 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -1504,9 +1504,6 @@
 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
     session->mfl_code = 1;
 #endif
-#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
-    session->trunc_hmac = 1;
-#endif
 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
     session->encrypt_then_mac = 1;
 #endif
@@ -4078,10 +4075,6 @@
     TEST_ASSERT( original.mfl_code == restored.mfl_code );
 #endif
 
-#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
-    TEST_ASSERT( original.trunc_hmac == restored.trunc_hmac );
-#endif
-
 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
     TEST_ASSERT( original.encrypt_then_mac == restored.encrypt_then_mac );
 #endif