Update submodule pointer to cbd40e0d (base fork master).
Per USB-IMPLEMENTATION-PLAN.md v2 P0-A1: xhcid/src/main.rs:141 formerly
hardcoded (None, InterruptMethod::Polling), bypassing the complete
get_int_method() that handles MSI-X/MSI/INTx. The IrqReactor's
run_with_irq_file path is fully wired and activates when irq_file is
Some — no other code assumed polling-only.
Oracle review confirmed correct register reads, loop continuation, and
EHB clearing already in the baseline. P0-A1 is a single-line restore.
vasilito
23e42a07f7