resources.conf: Update octphy net_device

Interface naming model changed after switching to debian9. eth1 is now
named enp2s0.

Change-Id: I86422452e6fd52015361d9e8508b7c74e20847a4
diff --git a/example/resources.conf b/example/resources.conf
index bec17b4..ce370a6 100644
--- a/example/resources.conf
+++ b/example/resources.conf
@@ -42,7 +42,7 @@
   band: GSM-1800
   trx_list:
   - hw_addr: 00:0c:90:2e:80:1e
-    net_device: eth1
+    net_device: enp2s0
 
 arfcn:
   - arfcn: 512