Record new broadcast_service type.

Commit: 38f0928f added a type for a
new system service.  This service did not exist previously, so mark
the type as not needing any compat entry.

Bug: 62573845
Test: None. Prebuilt change only.
Change-Id: I52d8e144c614b27f5c52fa99be6cfac87159bbcd

prebuilts/api/26.0/26.0.ignore.cil

@@ -3,7 +3,8 @@
 ;;   previous ones.  Add here to pass checkapi tests.
 (typeattribute new_objects)
 (typeattributeset new_objects
-  ( e2fs
+  ( broadcastradio_service
+    e2fs
     e2fs_exec
     hal_cas_hwservice
     kmsg_debug_device