tests/test_suite_pem: Augment DES test cases with AES: PEM

A few negative test cases in test_suite_pem.data rely on DES
(“invalid iv”, “malformed”). DES is deprecated.
Construct similar test cases using AES.

Signed-off-by: Tomás González <tomasagustin.gonzalezorlando@arm.com>
diff --git a/tests/suites/test_suite_pem.data b/tests/suites/test_suite_pem.data
index a34aa91..a4dff45 100644
--- a/tests/suites/test_suite_pem.data
+++ b/tests/suites/test_suite_pem.data
@@ -30,6 +30,10 @@
 depends_on:MBEDTLS_MD_CAN_MD5:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_DES_C
 mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,00$":"pwd":MBEDTLS_ERR_PEM_INVALID_ENC_IV:""
 
+PEM read (AES-128-CBC + invalid iv)
+depends_on:MBEDTLS_MD_CAN_MD5:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_AES_C
+mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-128-CBC,00$":"pwd":MBEDTLS_ERR_PEM_INVALID_ENC_IV:""
+
 PEM read (unknown encryption algorithm)
 depends_on:MBEDTLS_MD_CAN_MD5:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_AES_C
 mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-,00$":"pwd":MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG:""