subprojects: Add everything for local building

This makes it more trivial to build without the CI

Change-Id: I6ff0e8b128a870f89fcc9c1462b71d29f85d6117
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/subprojects/phosphor-dbus-interfaces.wrap b/subprojects/phosphor-dbus-interfaces.wrap
new file mode 100644
index 0000000..cb65be8
--- /dev/null
+++ b/subprojects/phosphor-dbus-interfaces.wrap
@@ -0,0 +1,6 @@
+[wrap-git]
+url = https://github.com/openbmc/phosphor-dbus-interfaces
+revision = HEAD
+
+[provide]
+phosphor-dbus-interfaces = phosphor_dbus_interfaces_dep