HO: Assign SDCCH on channel request

This is needed, so channel can be negotiated before the actual channel
type is assigned.

In case there is no SDCCH available, try to assign what ever the MS requested.
If this is not possible try to assign TCH/F. If this is still not possible,
reject channel request.

Change-Id: I10fc9f60c58c6b7ed424a86ce23bf6b9802c9eb1
1 file changed