systemc: Eliminate the unused PythonReadyFunc mechanism.

Change-Id: I8892e4d209901454f2ab923aa3fa9932d7963274
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54323
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/systemc/core/python.hh

@@ -33,15 +33,6 @@
 namespace sc_gem5
 {
 
-struct PythonReadyFunc
-{
-    PythonReadyFunc *next;
-
-    PythonReadyFunc();
-    ~PythonReadyFunc() {}
-    virtual void run() = 0;
-};
-
 struct PythonInitFunc
 {
     PythonInitFunc *next;