Adrian Chadd a2d74cc30b [ath] only apply the AR9300 delimiter workaround for the first sub-frame.
This is supposed to only be applied to the first subframe and only if
RTS/CTS is being done.  I'm still not yet checking RTS/CTS exchange status
so it's just happening for all subframes on AR9380 and later.

This gets MCS23 throughput up from around 250mbit to 303mbit with RTS/CTS
protection enabled, and around 330mbit with no HT protection enabled.

Now, MCS23 has a PHY rate of 450mbit and we should be seeing closer to
400mbit for a straight one-way UDP test, but this beats the previous
maximum throughput.

Tested:

* AR9380 (STA) -> AR9580 (AP) - STA with the modifications, doing UDP TX
  test using iperf.
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