Add "gateway_subscriber_state" to service_registry.yml

To trigger indexer also for the type gateway_subscriber_state
the annotation is added to the service registry config of
subscriberdb.

Signed-off-by: Alexander zur Bonsen <alexander.zur.bonsen@tngtech.com>

lte/cloud/configs/service_registry.yml

@@ -53,7 +53,7 @@ services:
       orc8r.io/state_indexer: "true"
       orc8r.io/swagger_spec: "true"
     annotations:
-      orc8r.io/state_indexer_types: "mobilityd_ipdesc_record"
+      orc8r.io/state_indexer_types: "mobilityd_ipdesc_record,gateway_subscriber_state"
       orc8r.io/state_indexer_version: "1"
       orc8r.io/obsidian_handlers_path_prefixes: >
         /magma/v1/lte/:network_id/msisdns,