Merge pull request #8 from shenki/https-submodule

Use https url for submodule
diff --git a/.gitmodules b/.gitmodules
index bad1eeb..2c4a18c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "buildroot"]
 	path = buildroot
-	url = git@github.com:open-power/buildroot.git
+	url = https://github.com/open-power/buildroot