TinyCrypt Test: Disable x509parse tests that don't apply to TC

TinyCrypt only supports Secp256r1, so skip all tests in test_suite_x509parse
which use different curves, while splitting those which rely on Secp256r1
alone into two tests: one for legacy ECC, and one for TinyCrypt.

Studying and improving the TinyCrypt test coverage is left for a later commit.
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index b81c1b1..96ad7d9 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -338,6 +338,11 @@
     } while( ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restart );
 
     TEST_ASSERT( ret == result );
+    if( flags != (uint32_t) flags_result )
+    {
+        fprintf( stderr, "Expected %#04x, got %#04x\n",
+                 (unsigned) flags_result, (unsigned) flags );
+    }
     TEST_ASSERT( flags == (uint32_t) flags_result );
 
     TEST_ASSERT( cnt_restart >= min_restart );
@@ -421,6 +426,12 @@
                                                 &flags, f_vrfy, NULL );
 
     TEST_ASSERT( res == ( result ) );
+    if( flags != (uint32_t) flags_result )
+    {
+        fprintf( stderr, "Expected %#04x, got %#04x\n",
+                 (unsigned) flags_result, (unsigned) flags );
+    }
+
     TEST_ASSERT( flags == (uint32_t)( flags_result ) );
 
 exit: