Add some more ip.access specific OML attributes/messages.  In this case it is 
about configuring the primary OML link IP address in the NVRAM of the device.

diff --git a/include/openbsc/abis_nm.h b/include/openbsc/abis_nm.h
index 5c1ae8e..af5ade0 100644
--- a/include/openbsc/abis_nm.h
+++ b/include/openbsc/abis_nm.h
@@ -212,6 +212,8 @@
 	NM_MT_IPACC_RSL_CONNECT		= 0xe0,
 	NM_MT_IPACC_RSL_CONNECT_ACK,
 	NM_MT_IPACC_RSL_CONNECT_NACK,
+	NM_MT_IPACC_RSL_SET_NVATTR	= 0xef,
+	NM_MT_IPACC_RSL_SET_NVATTR_ACK	= 0xff,
 };
 
 /* Section 9.2: Object Class */
@@ -335,6 +337,7 @@
 
 	NM_ATT_IPACC_RSL_BSC_IP		= 0x80,
 	NM_ATT_IPACC_RSL_BSC_PORT	= 0x81,
+	NM_ATT_IPACC_PRIM_OML_IP	= 0x88,
 
 	NM_ATT_BS11_RF_RES_IND_PER	= 0x8f,