Ensure WAIT packet upon HELO in --suspend mode

Upon suspending the app, we don't set mWaiting like we do in
waitingForDebugger. This is an error because this state is checked
upon handling HELO in DdmHandleHello chunk handler.

Mimicking what is done in waitingForDebugger ensure that WAIT is
sent and DDM client receive the event.

Bug: 266232837
Test: Manual
Change-Id: I3b8bc9af6f017f3a16c33ac38df7a9248c939a1a