meson: remove provide for phosphor-dbus-interfaces

The phosphor-dbus-interfaces repository now provides an
`meson.override_dependency` call which makes this unnecessary.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I0e9b0893141115ca4f55957c538579e173dcb21f
diff --git a/subprojects/phosphor-dbus-interfaces.wrap b/subprojects/phosphor-dbus-interfaces.wrap
index 346aa0c..935a8b2 100644
--- a/subprojects/phosphor-dbus-interfaces.wrap
+++ b/subprojects/phosphor-dbus-interfaces.wrap
@@ -1,6 +1,3 @@
 [wrap-git]
 url = https://github.com/openbmc/phosphor-dbus-interfaces.git
 revision = HEAD
-
-[provide]
-phosphor-dbus-interfaces = phosphor_dbus_interfaces_dep