vendor: charger> add 420dpi link

Change-Id: I240fb40d249e213bb0e05d75e97eec06301ee2c1
diff --git a/charger/images/420dpi b/charger/images/420dpi
new file mode 120000
index 0000000..716f5dd
--- /dev/null
+++ b/charger/images/420dpi
@@ -0,0 +1 @@
+480dpi
\ No newline at end of file