Re-enable this particular DELAY() for now, at least until the

TX and RX PCU stop/drain routines have been thoroughly debugged.

It's also very likely that I should add hooks back up to the
interface glue (if_ath_pci / if_ath_ahb) to do any relevant
bus flushes that are required.  A WMAC DDR flush may be required
for the AR9130 SoC.

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