Enable CRMP for mesages from the server side of the data model. (#6508)

This part seems to pass CI fine.  It's messages from the client that
are being a problem.

Author: bzbarsky-apple

src/app/util/chip-message-send.cpp

@@ -87,8 +87,6 @@ EmberStatus chipSendUnicast(Messaging::ExchangeContext * exchange, EmberApsFrame
     memcpy(buffer->Start() + frameSize, message, messageLength);
     buffer->SetDataLength(dataLength);
 
-    // TODO: Disable CRMP for now, because it just doesn't seem to work
-    sendFlags.Set(Messaging::SendMessageFlags::kNoAutoRequestAck);
     CHIP_ERROR err = exchange->SendMessage(Protocols::TempZCL::Id, 0, std::move(buffer), sendFlags);
 
     if (err != CHIP_NO_ERROR)