systemc: Switch to using predefined messages for core.

Create and use predefined messages for core which match the ones
Accellera uses.

Change-Id: I05b1398933f753946d5917f39d0f39c7cb45ed9f
Reviewed-on: https://gem5-review.googlesource.com/c/13323
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/core/SConscript

@@ -33,6 +33,7 @@ if env['USE_SYSTEMC']:
     Source('channel.cc')
     Source('event.cc')
     Source('kernel.cc')
+    Source('messages.cc')
     Source('module.cc')
     Source('object.cc')
     Source('port.cc')