Add OML definitions from OsmoBTS

Change-Id: I9c3bc15662949654e7bba6aad5488c69ee7d0c45
Related: OS#1615
diff --git a/include/osmocom/gsm/protocol/gsm_12_21.h b/include/osmocom/gsm/protocol/gsm_12_21.h
index 3c3a2c9..ed53dc6 100644
--- a/include/osmocom/gsm/protocol/gsm_12_21.h
+++ b/include/osmocom/gsm/protocol/gsm_12_21.h
@@ -615,6 +615,19 @@
 	uint8_t	subslot;	/*!< \brief E1 sub-slot */
 } __attribute__ ((packed));
 
+/*! \brief 3GPP TS 12.21 9.4.53 T200 index */
+enum abis_nm_t200_idx {
+	T200_SDCCH		= 0,
+	T200_FACCH_F		= 1,
+	T200_FACCH_H		= 2,
+	T200_SACCH_TCH_SAPI0	= 3,
+	T200_SACCH_SDCCH	= 4,
+	T200_SDCCH_SAPI3	= 5,
+	T200_SACCH_TCH_SAPI3	= 6
+};
+
+extern const uint8_t abis_nm_t200_ms[];
+
 /*! \brief Siemens BS-11 specific objects in the SienemsHW (0xA5) object class */
 enum abis_bs11_objtype {
 	BS11_OBJ_ALCO		= 0x01,