SEBA-770 Update Ponsim chart to use VOLTHA 1.7.0

Change-Id: I9aadd02f9031741ffb131dbc70ee1981c8e49236
diff --git a/ponsimv2/Chart.yaml b/ponsimv2/Chart.yaml
index 567aac7..5255c98 100644
--- a/ponsimv2/Chart.yaml
+++ b/ponsimv2/Chart.yaml
@@ -17,7 +17,7 @@
 description: PON Simulator
 icon: https://guide.opencord.org/logos/cord.svg
 
-version: 1.1.1
+version: 1.2.0
 
 # VOLTHA version
-appVersion: 1.6.0
+appVersion: 1.7.0