Add data directory for appcompat

This directory is used to store override config, so that they can
persist across reboot.

Test: atest CompatConfigTest
Bug: 145509340
Change-Id: I5e8f2b3093daeccd6c95dff24a8c6c0ff31235ca
diff --git a/private/file_contexts b/private/file_contexts
index 89c67fc..1e16169 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -561,6 +561,7 @@
 /data/misc/apexdata/com\.android\.wifi(/.*)?    u:object_r:apex_wifi_data_file:s0
 /data/misc/apexrollback(/.*)?   u:object_r:apex_rollback_data_file:s0
 /data/misc/apns(/.*)?           u:object_r:radio_data_file:s0
+/data/misc/appcompat(/.*)?      u:object_r:appcompat_data_file:s0
 /data/misc/audio(/.*)?          u:object_r:audio_data_file:s0
 /data/misc/audioserver(/.*)?    u:object_r:audioserver_data_file:s0
 /data/misc/audiohal(/.*)?       u:object_r:audiohal_data_file:s0