dcd/musb: clear rxrdy_consumed when stalling EP0

The actual-STALL path (no deferred SETUP) forced EP0 to IDLE but left
rxrdy_consumed set if the aborted transfer had parked RXRDY via NAK flow
control (e.g. a rejected OUT-data request in DATA_OUT). A subsequent
SETUP IRQ would then hit the parked-gate early return and be ignored,
relying on SentStall/SetupEnd to clear the flag first. Clear it here
so recovery never depends on that ordering.

Addresses Copilot review on #3699.

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

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