Create /metadata/apex/[sessions].

For storing persistent apex session state.

Bug: 126740531
Test: builds
Change-Id: Ibf280764977768956b5512b2252d22ceaba31c1e
diff --git a/rootdir/init.rc b/rootdir/init.rc
index f2e7a7c..1e742a7 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -389,6 +389,8 @@
     chmod 0700 /metadata/vold
     mkdir /metadata/password_slots 0771 root system
 
+    mkdir /metadata/apex 0700 root system
+    mkdir /metadata/apex/sessions 0700 root system
 on late-fs
     # Ensure that tracefs has the correct permissions.
     # This does not work correctly if it is called in post-fs.