Gem5Device: Avoid duplicate get_properties code

- Remove the duplicated get_properties code by calling the internal
  _get_android_properties method directly.

wlauto/devices/android/gem5/__init__.py

@@ -566,21 +566,9 @@ class Gem5Device(AndroidDevice):
                 # it quietly (not as an error/warning) and move on.
                 self.logger.debug('Could not pull property file "{}"'.format(propfile))
 
-        # This is duplicated from the AndroidDevice class, as we want to run
-        # this code without executing the BaseLinuxDevice implementation
-        props = {}
-        props['android_id'] = self.get_android_id()
-        buildprop_file = os.path.join(context.host_working_directory, 'build.prop')
-        if not os.path.isfile(buildprop_file):
-            self.pull_file('/system/build.prop', context.host_working_directory)
-        self._update_build_properties(buildprop_file, props)
-        context.add_run_artifact('build_properties', buildprop_file, 'export')
-
-        dumpsys_window_file = os.path.join(context.host_working_directory, 'window.dumpsys')
-        self.execute('{} > {}'.format('dumpsys window', 'window.dumpsys'))
-        self.pull_file('window.dumpsys', dumpsys_window_file)
-        context.add_run_artifact('dumpsys_window', dumpsys_window_file, 'meta')
-        return props
+        # As we do not call the super class, we explicitly need to
+        # process the Android properties.
+        props = self._get_android_properties(context)
 
     def get_directory(self, context, directory):
         """ Pull a directory from the device """