lchan_fsm: generate proper multirate configuration IE on RSL

During the generation of the multirate configuration IE in the channel
activation message that is sent over RSL, all AMR rates except the
highest one are trimmed. This was to ensure that the multirate
configuration IE only contains one codec rate per active set. Lets fix
that and generate a proper IE with threshold and hysteresis values.

- extend lchan_mr_config so that it can generate a full multirate
  configuration IE

Change-Id: I7f9f8e8d9e2724cbe3ce2f3599bc0e5185fd8453
Related: OS#3529
2 files changed