Create an encrypted directory for decompressing compressed APEX

We want to decompress into an encrypted directory so that it can later
be hard linked to other encrypted directories, such as /data/rollback.

Bug: 172911820
Test: atest ApexCompressionTests#testCompressedApexIsDecompressed
Change-Id: I98bc567ba7e8b1ea1b335830d71d1b1f38e6ea33
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 4478bea..099b4ef 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -655,6 +655,7 @@
     mkdir /data/apex 0755 root system encryption=None
     mkdir /data/apex/active 0755 root system
     mkdir /data/apex/backup 0700 root system
+    mkdir /data/apex/decompressed 0700 root system encryption=Require
     mkdir /data/apex/hashtree 0700 root system
     mkdir /data/apex/sessions 0700 root system
     mkdir /data/app-staging 0751 system system encryption=DeleteIfNecessary