[opus] Patches for adding 120 ms encoding

[Felicia Lim]

Hi Jean-Marc,

I still don't quite understand why you need to make 120 ms a special
> case, rather than extend the code that already handles 40 ms and 60 ms.
>

That was my intention with refactoring out the subframe encoding and
repacketizing bit. Or do you mean I should merge the explicit check for 120
ms frame and the existing checks for 40/60 ms wideband?

Thanks,
Felicia
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