Bluetooth: classic: avdtp: missing buffer length check

[lylezhu2012]

Describe the bug
Missing buffer length check before pulling the data from net buffer in function bt_avdtp_l2cap_recv.

To Reproduce
N/A

Expected behavior
Check the remaining buffer length before pulling the data from the net buffer.

Impact
May cause system crash.

Logs and console output
N/A

Environment (please complete the following information):
N/A

Additional context

[github-actions]

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[lylezhu2012]

The PR for the issue has been merged.