pcu: Enable 'egprs only' vty option if egprs requested

Change-Id: Idd0b5bf8769d693480268c0a0b89dbfd63779e48
diff --git a/src/osmo_gsm_tester/templates/osmo-pcu.cfg.tmpl b/src/osmo_gsm_tester/templates/osmo-pcu.cfg.tmpl
index 1d050c1..7445609 100644
--- a/src/osmo_gsm_tester/templates/osmo-pcu.cfg.tmpl
+++ b/src/osmo_gsm_tester/templates/osmo-pcu.cfg.tmpl
@@ -15,6 +15,9 @@
  alloc-algorithm dynamic
  alpha 0
  gamma 0
+%if osmo_pcu.egprs_enabled:
+ egprs only
+%endif
  gsmtap-category dl-unknown
  !gsmtap-category dl-dummy
  gsmtap-category dl-ctrl