rootdir: Create /data/misc/adb on boot

Change-Id: I0f8d11391cdcfbaa50f87f637a2962c6663b2767
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 313a98e..8497591 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -169,6 +169,7 @@
 
     # create basic filesystem structure
     mkdir /data/misc 01771 system misc
+    mkdir /data/misc/adb 02750 system shell
     mkdir /data/misc/bluedroid 0770 bluetooth bluetooth
     mkdir /data/misc/bluetooth 0770 system system
     mkdir /data/misc/keystore 0700 keystore keystore