[1/2] LCD density backup

Change-Id: I2b8c7aa2419b689d5bb98a02e3c68dd2e5e0d527
diff --git a/prebuilt/common/etc/backup.conf b/prebuilt/common/etc/backup.conf
new file mode 100755
index 0000000..3cb7190
--- /dev/null
+++ b/prebuilt/common/etc/backup.conf
@@ -0,0 +1 @@
+persist_lcd_density=1