systemc: associate tlm payload and gem5 packet in blocking interfaces

TlmToGem5Bridge only associates the tlm payload and gem5 packet in
nb_transport case. We should also do the samething in blocking
interfaces. Otherwise, the downstream Gem5ToTlmBridge cannot get the
correct payload.

Change-Id: I85b213402d58d68641615a6cea04961f4a15f1ba
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/63772
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed