ublox-gsm-config: Add empty apn.conf as placeholder

Should help avoiding errors when manually writing this file.

BugzID: 60832

recipes-connectivity/ublox-gsm-config/files/apn.conf

@@ -0,0 +1,15 @@
+#
+# Define a private APN to be used by the modem
+# This file is part of ublox-gsm-config service
+#
+# Required fields:
+#     apn:      Name of the access point
+#     user:     Username used to authenticate on APN
+#     password: Password used to authenticate on APN
+#
+
+
+[default]
+apn=
+user=
+password=

recipes-connectivity/ublox-gsm-config/ublox-gsm-config.bb

@@ -16,6 +16,7 @@ SRC_URI =  " \
     file://ublox-gsm-config.py \
     file://modem-config-dump.py \
     file://sim.conf \
+    file://apn.conf \
     "
 
 S = "${WORKDIR}"
@@ -42,7 +43,6 @@ do_install () {
 
     install -d ${D}/etc
     install -m 0644 sim.conf ${D}/etc/
+    install -m 0644 apn.conf ${D}/etc/
 
 }
-
-