fix(dialyzer): fix dialyzer warnings for emqx app standalone

apps/emqx/rebar.config

@@ -66,7 +66,7 @@
     {plt_location, "."},
     {plt_prefix, "emqx_dialyzer"},
     {plt_apps, all_apps},
-    {plt_extra_apps, [hocon]},
+    {plt_extra_apps, [hocon,mnesia,bcrypt,os_mon,pbkdf2,emqx_http_lib, recon]},
     {statistics, true}
 ]}.