Make project buildable with subproject

Subproject dependencies make this project easier to build and maintain.

Change-Id: I26c2221d7d7984d38d782b2abc3115d227c60cfe
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/subprojects/sdbusplus.wrap b/subprojects/sdbusplus.wrap
new file mode 100644
index 0000000..7b076d0
--- /dev/null
+++ b/subprojects/sdbusplus.wrap
@@ -0,0 +1,6 @@
+[wrap-git]
+url = https://github.com/openbmc/sdbusplus.git
+revision = HEAD
+
+[provide]
+sdbusplus = sdbusplus_dep