patman: Move library functions into a library directory

The patman directory has a number of modules which are used by other tools
in U-Boot. This makes it hard to package the tools using pypi since the
common files must be copied along with the tool that uses them.

To address this, move these files into a new u_boot_pylib library. This
can be packaged separately and listed as a dependency of each tool.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/u_boot_pylib/__main__.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright 2023 Google LLC
+#
+
+import os
+import sys
+
+if __name__ == "__main__":
+    # Allow 'from u_boot_pylib import xxx to work'
+    our_path = os.path.dirname(os.path.realpath(__file__))
+    sys.path.append(os.path.join(our_path, '..'))
+
+    # Run tests
+    from u_boot_pylib import terminal
+    from u_boot_pylib import test_util
+
+    result = test_util.run_test_suites(
+        'u_boot_pylib', False, False, False, None, None, None,
+        ['terminal'])
+
+    sys.exit(0 if result.wasSuccessful() else 1)