Define WANT symbols for always-supported key types

PSA_KEY_TYPE_RAW_DATA and PSA_KEY_TYPE_DERIVE are always supported.
Make this explicit by declaring PSA_WANT_KEY_TYPE_RAW_DATA and
PSA_WANT_KEY_TYPE_DERIVE unconditionally. This makes it easier to
infer dependencies in a systematic way.

Don't generate not-supported test cases for those key types. They
would always be skipped, which is noise and would make it impossible
to eventually validate that all test cases pass in at least one
configuration over the whole CI.

Don't remove the exception in set_psa_test_dependencies.py for now, to
get less noise in dependencies. This may be revised later if it is
deemed more important to be systematic.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

tests/scripts/generate_psa_tests.py

@@ -119,8 +119,12 @@ class TestGenerator:
         filename = os.path.join(self.test_suite_directory, basename + '.data')
         test_case.write_data_file(filename, test_cases)
 
-    @staticmethod
+    ALWAYS_SUPPORTED = frozenset([
+        'PSA_KEY_TYPE_DERIVE',
+        'PSA_KEY_TYPE_RAW_DATA',
+    ])
     def test_cases_for_key_type_not_supported(
+            self,
             kt: crypto_knowledge.KeyType,
             param: Optional[int] = None,
             param_descr: str = '',
@@ -131,8 +135,9 @@ class TestGenerator:
         parameter not being supported. If it is absent or None, emit test cases
         conditioned on the base type not being supported.
         """
-        if kt.name == 'PSA_KEY_TYPE_RAW_DATA':
-            # This key type is always supported.
+        if kt.name in self.ALWAYS_SUPPORTED:
+            # Don't generate test cases for key types that are always supported.
+            # They would be skipped in all configurations, which is noise.
             return []
         import_dependencies = [('!' if param is None else '') +
                                psa_want_symbol(kt.name)]