[patch] Fix TBTT, TSF handling for TDMA on AR5416 and later chips

[Adrian Chadd]

Hi Yin, all;

I've done a bit of tidying up of Yin's TDMA related cleanups.

In particular, I've added a new capability (HAL_CAP_LONG_RXDESC_TSF)
which the AR5416 and later chips set. This indicates the received TSF
is 32 bits rather than 15 bits.

Yin, would you mind testing this in your local setup and make sure it
works the same as your patch? I'll submit it for inclusion into -HEAD
/ 9.0 if it does.

Thanks again for your great work!



adrian
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