subprojects: Fix wrapfile provides

Our packages depend on being able to map the dependencies so we should
add them to the wrap.

Change-Id: Ie4500329c28d18bbde8d8c7e51015f5a3ad48466
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/subprojects/phosphor-dbus-interfaces.wrap b/subprojects/phosphor-dbus-interfaces.wrap
index 0be70dd..cb65be8 100644
--- a/subprojects/phosphor-dbus-interfaces.wrap
+++ b/subprojects/phosphor-dbus-interfaces.wrap
@@ -1,3 +1,6 @@
 [wrap-git]
 url = https://github.com/openbmc/phosphor-dbus-interfaces
 revision = HEAD
+
+[provide]
+phosphor-dbus-interfaces = phosphor_dbus_interfaces_dep