dcd/musb: check SentStall/SetupEnd before DATAEND guard

MUSBMHDRC 21.1.5 requires the EP0 service routine to check SentStall
and SetupEnd first; the early DATAEND return ran before both, and
SentStall is most likely to fire exactly while DataEnd may still read
back set (auto-STALL after DataEnd, 21.1.7), which would skip the
recovery. The guard also moves below the RXRDY block so a coalesced
DATAEND|RXRDY read cannot swallow a SETUP on cores where the
CPU-set-only DataEnd bit reads back 1; the comment documents the
vendor-dependent read-back.

Review follow-up for #3643 (dcd_musb.c l.445 finding).

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

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