UDS: Update import to align with upstream changes

[sunnyhaibin]

Description

• uds.py has been migrated from panda to opendbc, which means this script will currently break when running on branches using the latest upstream code.
• This change updates the import paths to maintain compatibility with the updated upstream structure. It also removes the fallback mechanism for handling different installation environments, simplifying the script's dependencies.
• Ensures that the script works seamlessly with the latest code and avoids potential breakages when used alongside future upstream changes.

Upstream PRs

• Move uds.py commaai/openpilot#34374
• cp panda/python/uds.py opendbc/car/uds.py commaai/opendbc#1598
• remove uds from panda commaai/panda#2121

[calvinpark]

Please add the old imports back. One of the more popular fork/branch is anbuck's TSK port onto an old FP version, which uses the old import path.