Fix up the nexttbtt -> TSF delta calculation to not wrap ridiculously

on the 802.11n NICs.

The 802.11n NICs return a TBTT value that continues far past the 16 bit
HAL_BEACON_PERIOD time (in TU.)  The code would constrain nextslot to
HAL_BEACON_PERIOD, but it wasn't constraining nexttbtt - the pre-11n
NICs would only return TU values from 0 -> HAL_BEACON_PERIOD.  Thus,
when nexttbtt exceeded 64 milliseconds, it would not wrap (but nextslot
did) which lead to a huge tsfdelta.

So until the slot calculation is converted to work in TSF rather than
a mix of TSF and TU, "make" the nexttbtt values match the TU assumptions
for pre-11n NICs.

This fixes the crazy deltatsf calculations but it doesn't fix the
non-convergent tsfdelta issue.  That'll be fixed in a subsequent commit.

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