RSL_Emulation: Add procedure calls to suspend/resume dchan handling

We introduce a procedure by which any DchanHandler can globally
disable all receiving/processing of DChan related messages.  This is
required in upcoming handover code, as we need to block handling
of messages such as RSL IPAC CRCX on the new Dchan before we have
processed the RR HANDOVER CMD and raised an associated expect here in
the RSL emulation code.

Change-Id: Ibef65f87d0d481accbc0e019874dd43b3f9a5dbc
1 file changed