Skip flattened apexes while check_target_files_vintf

Flattened apexes should be handled differently. For now just skip
flattened apexes to fix the build breakage.

Bug: 253669548
Bug: 253700117
Bug: 239055765
Test: m otapackage for targets with "flattened apexes"
Change-Id: I102a961fc1365f42881ca9ee6546e71246792d2a

tools/releasetools/check_target_files_vintf.py

@@ -241,6 +241,10 @@ def PrepareApexDirectory(inp):
     for f in os.listdir(path):
       logger.info('  adding APEX %s', os.path.basename(f))
       apex = os.path.join(path, f)
+      if os.path.isdir(apex):
+        # TODO(b/242314000) Handle "flattened" apex
+        pass
+      else:
         cmd = [deapexer,
                '--debugfs_path', debugfs_path,
                'info',