[Feature][YUKUAI_patch]add 18.02 code

Only Configure: No
Affected branch: master
Affected module: unknow
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: No

Change-Id: I7f71153004f10fc0ea5adfa083866aaeeb1053ac
diff --git a/rootfs/usr/lib/busybox/sbin/freeramdisk b/rootfs/usr/lib/busybox/sbin/freeramdisk
new file mode 100755
index 0000000..1fb774d
--- /dev/null
+++ b/rootfs/usr/lib/busybox/sbin/freeramdisk
@@ -0,0 +1 @@
+#!/bin/busybox.nosuid
\ No newline at end of file