[GPRS] add data structures for OML of NSE,CELL,NSVCE

Supporting GPRS means we have a number of additional OML objects to
deal with.  We need to extend our gsm_bts structure to at least
include the nm_state for each of those objects.
diff --git a/openbsc/src/abis_nm.c b/openbsc/src/abis_nm.c
index 369eaf6..b5f10bd 100755
--- a/openbsc/src/abis_nm.c
+++ b/openbsc/src/abis_nm.c
@@ -656,6 +656,17 @@
 			return NULL;
 		nm_state = &bts->bs11.envabtse[obj_inst->trx_nr].nm_state;
 		break;
+	case NM_OC_GPRS_NSE:
+		nm_state = &bts->gprs.nse.nm_state;
+		break;
+	case NM_OC_GPRS_CELL:
+		nm_state = &bts->gprs.cell.nm_state;
+		break;
+	case NM_OC_GPRS_NSVC:
+		if (obj_inst->trx_nr > ARRAY_SIZE(bts->gprs.nsvc))
+			return NULL;
+		nm_state = &bts->gprs.nsvc[obj_inst->trx_nr].nm_state;
+		break;
 	}
 	return nm_state;
 }
@@ -695,6 +706,17 @@
 	case NM_OC_SITE_MANAGER:
 		obj = &bts->site_mgr;
 		break;
+	case NM_OC_GPRS_NSE:
+		obj = &bts->gprs.nse;
+		break;
+	case NM_OC_GPRS_CELL:
+		obj = &bts->gprs.cell;
+		break;
+	case NM_OC_GPRS_NSVC:
+		if (obj_inst->trx_nr > ARRAY_SIZE(bts->gprs.nsvc))
+			return NULL;
+		obj = &bts->gprs.nsvc[obj_inst->trx_nr];
+		break;
 	}
 	return obj;
 }