Initialize textclassifier model update directory

Test: Builds successfully. Directory is initialized on install. Tests pass.
bit FrameworksCoreTests:android.view.textclassifier.TextClassificationManagerTest
Bug: 34780396

Merged-In: Icbf7962f11b66579931f48053132da6e03e62c61
Change-Id: Icbf7962f11b66579931f48053132da6e03e62c61
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 15fce90..def686b 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -387,6 +387,7 @@
     mkdir /data/misc/radio 0770 system radio
     mkdir /data/misc/sms 0770 system radio
     mkdir /data/misc/zoneinfo 0775 system system
+    mkdir /data/misc/textclassifier 0771 system system
     mkdir /data/misc/vpn 0770 system vpn
     mkdir /data/misc/shared_relro 0771 shared_relro shared_relro
     mkdir /data/misc/systemkeys 0700 system system