Add a temporary workaround so the 11n rate scenario setup code sets a useful TX chainmask.
Add a temporary workaround so the 11n rate scenario setup code sets a useful
TX chainmask.

since the upper layers don't (yet) know about the active TX/RX chainmasks,
it can't tell the rate scenario functions what to use. I'll eventually sort
this out; this restores functionality in the meantime.

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