Add interface info to .rc files

Signed-off-by: Felix <google@ix5.org>
Change-Id: I6d70bbdb66c3dce280bf6908c3750316a6f6cf70
diff --git a/graphics/composer/2.1/default/android.hardware.graphics.composer@2.1-service.rc b/graphics/composer/2.1/default/android.hardware.graphics.composer@2.1-service.rc
index 5a5b51e..cbd589a 100644
--- a/graphics/composer/2.1/default/android.hardware.graphics.composer@2.1-service.rc
+++ b/graphics/composer/2.1/default/android.hardware.graphics.composer@2.1-service.rc
@@ -1,4 +1,5 @@
 service vendor.hwcomposer-2-1 /vendor/bin/hw/android.hardware.graphics.composer@2.1-service
+    interface android.hardware.graphics.composer@2.1::IComposer default
     class hal animation
     user system
     group graphics drmrpc