hodec2: fix congestion balancing on dyn TS

When balancing congestion, not only look at TCH/F or TCH/H separately,
but also to take into account the effects on the other TCH kind from
using/freeing dynamic TS.

Related: OS#5298
Change-Id: I433df6f343650f9056b1bab926bc19ac1d867ad5
2 files changed