When assembling the descriptor list, make sure that the "first" descriptor

is marked correctly.

The existing logic assumed that the first descriptor is i == 0, which
doesn't hold for EDMA TX.  In this instance, the first time filltxdesc()
is called can be up to i == 3.

So for a two-buffer descriptor:

* firstSeg is set to 0;
* lastSeg is set to 1;
* the ath_hal_filltxdesc() code will treat it as the last segment in
  a descriptor chain and blank some of the descriptor fields, causing
  the TX to stop.

When firstSeg is set to 1 (regardless of lastSeg), it overrides the
lastSeg setting.  Thus, ath_hal_filltxdesc() won't blank out these
fields.

Tested: AR9380, STA mode.  With this, association is successful.

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