Add 3rdparty as submodule

The build system will make sure only to fetch this if
desired by the user.

Change-Id: Ie3c1b44f67ba2595cae001234e29e36cf855a3e4
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/956
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..e53e9af
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "3rdparty"]
+	path = 3rdparty
+	url = ../blobs.git
+	update = none