fix releasetools_test

Some test cases are failing because tests are not updated accordinly.

Bug: n/a
Test: atest releasetools_test
Change-Id: I3df071f72f01dedd6df4fa462ca52b8a0b1ffd4e

tools/releasetools/test_build_image.py

@@ -196,7 +196,7 @@ class BuildImageTest(test_utils.ReleaseToolsTestCase):
     p.communicate()
     self.assertEqual(0, p.returncode)
 
-    fs_dict = GetFilesystemCharacteristics(output_file)
+    fs_dict = GetFilesystemCharacteristics('ext4', output_file)
     self.assertEqual(int(fs_dict['Block size']), 4096)
     self.assertGreaterEqual(int(fs_dict['Free blocks']), 0) # expect ~88
     self.assertGreater(int(fs_dict['Inode count']), 0)      # expect ~64

tools/releasetools/test_sign_apex.py

@@ -69,5 +69,5 @@ class SignApexTest(test_utils.ReleaseToolsTestCase):
         payload_key,
         container_key,
         False,
-        codename_to_api_level_map={'S': 31})
+        codename_to_api_level_map={'S': 31, 'Tiramisu' : 32})
     self.assertTrue(os.path.exists(signed_apex))