dcd/musb: extract pipe0_process_status_isr() to de-dup EP0 tail paths

The deferral (RXRDY-combined) and csrl==0 tail paths in process_ep0_isr
ran the same per-state status-stage logic. Move all of it into one
pipe0_process_status_isr() helper covering every state including
DATA_IN, which picks STATUS_OUT vs STATUS_OUT_PENDING_IRQ from
deferred_setup_valid (a deferred SETUP means the status confirm was
coalesced with it). Both callers now just invoke the helper; the
deferral path saves the SETUP and sets deferred_setup_valid first.

Also drops the deferral path's TU_ASSERT(remain_wlength == 0), which
was wrong for a short last DATA-IN packet, and renames
pipe0_process_deferred_setup -> pipe0_try_deferred_setup (it no-ops
when nothing is deferred).

Verified: HIL pass on ek_tm4c123gxl and max32666fthr (13/13 each),
including the #3643 high-CPU-load IRQ-toggle coalescing stress.

Co-Authored-By: Claude Fable 5 <[email protected]>

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