systemc: Purposefully *expose* bind in the initiator socket.

Apparently the base version of bind actually *is* supposed to be
accessible, so expose it with using instead of hiding it.

Change-Id: Ie762c35d6322e744696ed597189b7773ea68c3b7
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23322
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed