gsm_08_08.h: Add extra field elements defined in other sections

The Signalling Field Element Coding list defined in 3.2.3 is used in
"Old BSS to New BSS Information" and "New BSS to old BSS Information"
IEs. However, the former IE (Old->New Info) defines 2 extra Field
Elements in 3.2.2.58 (3GPP TS 48.008 version 16.0.0 Release 16) not
present in 3.2.3.

Related: SYS#5337
Change-Id: I4db3f7974887e4c798a30c5b51a19472ceeee27d
diff --git a/include/osmocom/gsm/protocol/gsm_08_08.h b/include/osmocom/gsm/protocol/gsm_08_08.h
index 7ef7a29..983783e 100644
--- a/include/osmocom/gsm/protocol/gsm_08_08.h
+++ b/include/osmocom/gsm/protocol/gsm_08_08.h
@@ -333,7 +333,8 @@
 	GSM0808_IE_OSMO_OSMUX_CID		= 0xf1,
 };
 
-/* 3GPP TS 48.008 3.2.3 Signalling Field Element Coding */
+/* 3GPP TS 48.008 3.2.3 Signalling Field Element Coding.
+   See also extra fields in 3.2.2.58 and 3.2.2.80 */
 enum GSM0808_SIGNALLING_FIELD_ELEMENT_CODING {
 	GSM0808_FE_IE_EXTRA_INFORMATION = 0x01, /*< 3.2.3.1  */
 	GSM0808_FE_IE_CURRENT_CHANNEL_TYPE_2 = 0x02, /*< 3.2.3.2  */
@@ -353,6 +354,8 @@
 	GSM0808_FE_IE_IRAT_MEASUREMENT_CONFIGURATION = 0x0f, /*< 3.2.3.16 */
 	GSM0808_FE_IE_SOURCE_CELL_ID = 0x10, /*< 3.2.3.17 */
 	GSM0808_FE_IE_IRAT_MEASUREMENT_CONFIGURATION_EXTENDED_E_ARFCNS = 0x11, /*< 3.2.3.18 */
+	GSM0808_FE_IE_VGCS_TALKER_MODE = 0x6f, /*< 3.2.2.93 */
+	GSM0808_FE_IE_LAST_USED_EUTRAN_PLMN_ID = 0x95, /*< 3.2.2.127 */
 };
 
 /* 3GPP TS 48.008 3.2.2.5 Cause */