gsm_08_08.h: Add IEI definitions from Release 15

Change-Id: If3649606ba7c25121e30ed02939ca08c94665be5
diff --git a/include/osmocom/gsm/protocol/gsm_08_08.h b/include/osmocom/gsm/protocol/gsm_08_08.h
index 33f3a6f..721da33 100644
--- a/include/osmocom/gsm/protocol/gsm_08_08.h
+++ b/include/osmocom/gsm/protocol/gsm_08_08.h
@@ -298,6 +298,11 @@
 	GSM0808_IE_CN_TO_MS_TRANSP_INFO		= 0x93,
 	GSM0808_IE_SELECTED_PLMN_ID		= 0x94,
 	GSM0808_IE_LAST_USED_EUTRAN_PLMN_ID	= 0x95,
+	GSM0808_IE_OLD_LAI			= 0x96,
+	GSM0808_IE_ATTACH_INDICATOR		= 0x97,
+	GSM0808_IE_SELECTED_OPERATOR		= 0x98,
+	GSM0808_IE_PS_REGISTERED_OPERATOR	= 0x99,
+	GSM0808_IE_CS_REGISTERED_OPERATOR	= 0x9a,
 };
 
 /* 3GPP TS 48.008 3.2.3 Signalling Field Element Coding */