Added a move flag for init's mount command that maps to MS_MOVE.

Change-Id: I7bc1a8ac5f73a34c101247f984cbf9ff29e02e7f
diff --git a/init/builtins.c b/init/builtins.c
index b4af700..44faf17 100644
--- a/init/builtins.c
+++ b/init/builtins.c
@@ -255,6 +255,7 @@
     const char *name;
     unsigned flag;
 } mount_flags[] = {
+    { "move",       MS_MOVE },
     { "noatime",    MS_NOATIME },
     { "nosuid",     MS_NOSUID },
     { "nodev",      MS_NODEV },