Add subprojects

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I1f9a13a8113ed632fa82d61acbf7c160d355cce8
diff --git a/subprojects/phosphor-dbus-interfaces.wrap b/subprojects/phosphor-dbus-interfaces.wrap
new file mode 100644
index 0000000..935a8b2
--- /dev/null
+++ b/subprojects/phosphor-dbus-interfaces.wrap
@@ -0,0 +1,3 @@
+[wrap-git]
+url = https://github.com/openbmc/phosphor-dbus-interfaces.git
+revision = HEAD