rolling: new plugin

This plugin provides support for modems from Rolling Wireless. The
current approach is to re-use the AT-based and MBIM-based specific
modem implementations from the Fibocom plugin.

Based on an original implementation from:
vanillan wang <vanillanwang@163.com>

See https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/1170

src/plugins/tests/test-udev-rules.c

@@ -192,6 +192,14 @@ test_linktop (void)
 }
 #endif
 
+#if defined ENABLE_PLUGIN_ROLLING
+static void
+test_rolling (void)
+{
+    common_test (TESTUDEVRULESDIR_ROLLING);
+}
+#endif
+
 /************************************************************/
 
 int main (int argc, char **argv)
@@ -253,6 +261,9 @@ int main (int argc, char **argv)
 #if defined ENABLE_PLUGIN_LINKTOP
     g_test_add_func ("/MM/test-udev-rules/linktop", test_linktop);
 #endif
+#if defined ENABLE_PLUGIN_ROLLING
+    g_test_add_func ("/MM/test-udev-rules/rolling", test_rolling);
+#endif
 
     return g_test_run ();
 }