osmo-bts-trx: set l1c logging level to notice

We have sporadic osmo-bts-trx shutdowns with "No clock from osmo-trx" error
messages. Around it are L1C logs on level 'notice', so let's log those as well.

Related: OS#2325
Change-Id: Ic306d2dd8670550d84e9c446098bccaba147e13b
diff --git a/src/osmo_gsm_tester/templates/osmo-bts-trx.cfg.tmpl b/src/osmo_gsm_tester/templates/osmo-bts-trx.cfg.tmpl
index 628aefa..452b920 100644
--- a/src/osmo_gsm_tester/templates/osmo-bts-trx.cfg.tmpl
+++ b/src/osmo_gsm_tester/templates/osmo-bts-trx.cfg.tmpl
@@ -9,7 +9,7 @@
   logging level rll debug
   logging level rr debug
   logging level rsl debug
-  logging level l1c error
+  logging level l1c notice
   logging level l1p error
 !
 phy 0