Create /mnt/pre_reboot_dexopt on init for Pre-reboot Dexopt.

Bug: 311377497
Test: manual - Boot the device and see the directory.
Change-Id: I083e0dc3c8d16839122a42fc3d00cdcac07a5cb8
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 8a2ed9f..1e0fa9a 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -303,6 +303,9 @@
     mkdir /mnt/runtime/full 0755 root root
     mkdir /mnt/runtime/full/self 0755 root root
 
+    # For Pre-reboot Dexopt
+    mkdir /mnt/pre_reboot_dexopt 0755 artd artd
+
     # Symlink to keep legacy apps working in multi-user world
     symlink /storage/self/primary /mnt/sdcard
     symlink /mnt/user/0/primary /mnt/runtime/default/self/primary