change wiringpi submodule url

Change-Id: I902f52c8568420e9db0278770901121d623b6f90
diff --git a/.gitmodules b/.gitmodules
index ae04bda..8c81277 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "WiringPi"]
 	path = WiringPi
-	url = https://github.com/hardkernel/wiringPi.git
+	url = https://git.odroid.com/wiringPi