Create appcompat data dir

This is currently used for persisting the compat framework overrides
across reboots.

Test: atest CompatConfigTest
Bug: 145509340
Change-Id: I9205388b44a337a5b56b78cb6cc78f09494a623e
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 19c00f9..a3ddf52 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -731,6 +731,7 @@
     mkdir /data/misc/installd 0700 root root
     mkdir /data/misc/apexdata 0711 root root
     mkdir /data/misc/apexrollback 0700 root root
+    mkdir /data/misc/appcompat/ 0700 system system
     mkdir /data/misc/snapshotctl_log 0755 root root
     # create location to store pre-reboot information
     mkdir /data/misc/prereboot 0700 system system