Fix/atcphy pipehandler#503
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Two fixes observed on J313 (M1 MacBook Air) with a USB-C multiport hub:
Retry pipehandler lock with backoff: Replace the single poll with up to 10 retries at 5–10 ms intervals (~100 ms total). Avoids having to hard cycle the usb-c connection.
Fix teardown race and spurious WARN on USB3_DP. Scope the WARN to the failure case only.
Tested on Fedora Asahi Remix 44, kernel 6.19.