update openbsc.cfg examples for new gprs syntax
diff --git a/openbsc/src/openbsc.cfg.nanobts.multitrx b/openbsc/src/openbsc.cfg.nanobts.multitrx
index 2bd6e3f..d9fb54b 100644
--- a/openbsc/src/openbsc.cfg.nanobts.multitrx
+++ b/openbsc/src/openbsc.cfg.nanobts.multitrx
@@ -50,7 +50,7 @@
   rach max transmission 7
   ip.access unit_id 1800 0
   oml ip.access stream_id 255
-  gprs enabled 0
+  gprs mode none
   trx 0
    rf_locked 0
    arfcn 871