systemc: fix gem5_to_tlm bridge

systemc: fix gem5_to_tlm bridge

The original implementation doesn't set trans and phase correctly when
scheduling PayloadEvent, and causes unexpected behavior after the event started.

This change fixes the wrong event triggering by directly applying
tlm_utils::peq instead of creating another one.

Change-Id: I207567b57f4b49c3c4ebe117d624e5cc9915c12a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23823
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>