Add missing PSA init

EC might be supported through PSA, so use `MD_OR_USE_PSA_INIT`
in pk_parse_{public_}keyfile_ec.

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>
diff --git a/tests/suites/test_suite_pkparse.function b/tests/suites/test_suite_pkparse.function
index 43dcea5..d416b87 100644
--- a/tests/suites/test_suite_pkparse.function
+++ b/tests/suites/test_suite_pkparse.function
@@ -83,7 +83,7 @@
     int res;
 
     mbedtls_pk_init(&ctx);
-    MD_PSA_INIT();
+    MD_OR_USE_PSA_INIT();
 
     res = mbedtls_pk_parse_public_keyfile(&ctx, key_file);
 
@@ -104,7 +104,7 @@
 
 exit:
     mbedtls_pk_free(&ctx);
-    MD_PSA_DONE();
+    MD_OR_USE_PSA_DONE();
 }
 /* END_CASE */
 
@@ -115,7 +115,7 @@
     int res;
 
     mbedtls_pk_init(&ctx);
-    MD_PSA_INIT();
+    MD_OR_USE_PSA_INIT();
 
     res = mbedtls_pk_parse_keyfile(&ctx, key_file, password,
                                    mbedtls_test_rnd_std_rand, NULL);
@@ -134,7 +134,7 @@
 
 exit:
     mbedtls_pk_free(&ctx);
-    MD_PSA_DONE();
+    MD_OR_USE_PSA_DONE();
 }
 /* END_CASE */