base, sim, dev: Remove SWIG

Remove SWIG guards and SWIG-specific C++ code.

Change-Id: Icaad6720513b6f48153727ef3f70e0dba0df4bee
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Andreas Hansson <andreas.hansson@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/2921
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Tony Gutierrez <anthony.gutierrez@amd.com>

src/dev/net/etherdevice.hh

@@ -128,10 +128,8 @@ class EtherDevice : public PciDevice
  * The Python object hierarchy includes the EtherDevBase class which
  * is used by some ethernet devices as a way to share common
  * configuration information in the generated param structs. Since the
- * Python hierarchy is used to generate a SWIG interface for all C++
- * SimObjects, we need to reflect this in the C++ object hierarchy. If
- * we don't, SWIG might end up doing 'bad things' when it down casts
- * ethernet objects to their base class(es).
+ * Python hierarchy is used to generate a Python interfaces for all C++
+ * SimObjects, we need to reflect this in the C++ object hierarchy.
  */
 class EtherDevBase : public EtherDevice
 {