Add more unit test for pk_sign_ext

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/suites/test_suite_pk.data b/tests/suites/test_suite_pk.data
index e8f790c..8a3a176 100644
--- a/tests/suites/test_suite_pk.data
+++ b/tests/suites/test_suite_pk.data
@@ -341,7 +341,11 @@
 depends_on:MBEDTLS_ECP_DP_BP512R1_ENABLED
 pk_psa_sign:MBEDTLS_ECP_DP_BP512R1:PSA_ECC_FAMILY_BRAINPOOL_P_R1:512
 
-PK Sign ext:PK_RSASSA_PSS,MD_SHA512
+PK Sign ext:RSA2048,PK_RSASSA_PSS,MD_SHA512
 depends_on:MBEDTLS_X509_RSASSA_PSS_SUPPORT:MBEDTLS_SHA512_C
 pk_psa_sign_ext:MBEDTLS_PK_RSA:2048:MBEDTLS_PK_RSASSA_PSS:MBEDTLS_MD_SHA512
 
+PK Sign ext:RSA2048,PK_RSA,MD_SHA512
+depends_on:MBEDTLS_X509_RSASSA_PSS_SUPPORT:MBEDTLS_SHA512_C:MBEDTLS_PKCS1_V15
+pk_psa_sign_ext:MBEDTLS_PK_RSA:2048:MBEDTLS_PK_RSA:MBEDTLS_MD_SHA512
+