vendor: gapps backup for 7.1

Change-Id: I6aa286c5fdf2d37455c5fa64713df399ea04b7f5
diff --git a/prebuilt/bin/backuptool.sh b/prebuilt/bin/backuptool.sh
index 799011d..85566e2 100755
--- a/prebuilt/bin/backuptool.sh
+++ b/prebuilt/bin/backuptool.sh
@@ -5,7 +5,7 @@
 
 export C=/tmp/backupdir
 export S=/system
-export V=7.0
+export V=7.1
 
 # Preserve /system/addon.d in /tmp/addon.d
 preserve_addon_d() {