gsm_data_shared.h: Remove unused enum gsm_paging_event

Change-Id: I13f30177a4840d68e3d374861fb9c76e9842be2e
diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index 8caedff..f113904 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -235,13 +235,6 @@
 	GSM_HOOK_RR_SECURITY,
 };
 
-enum gsm_paging_event {
-	GSM_PAGING_SUCCEEDED,
-	GSM_PAGING_EXPIRED,
-	GSM_PAGING_OOM,
-	GSM_PAGING_BUSY,
-};
-
 enum bts_gprs_mode {
 	BTS_GPRS_NONE = 0,
 	BTS_GPRS_GPRS = 1,