res_parking: Make load_pri explicit.

res_parking has an implicit load_pri of 0 meaining it's one of the very
first modules loaded after modules with global symbols.  Set it
explicitly in the AST_MODULE_INFO block.

Change-Id: I297b6fb3ff6993ec004e667b22a74f5925906259

res/res_parking.c

@@ -1300,4 +1300,5 @@ AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Call Parking Resource
 	.load = load_module,
 	.unload = unload_module,
 	.reload = reload_module,
+	.load_pri = 0,
 );