Add policy for CompOS APEX data files.

Grant access to odsign to read & delete pending key files. Eventually
we will grant the CompOS daemon write access.

Bug: 190166662
Test: Via odsign; no denials seen.
Change-Id: I6d3c3e5b2aec8ef65bd28cbb274d18263534ce66
diff --git a/private/file.te b/private/file.te
index 29ab8a9..124309c 100644
--- a/private/file.te
+++ b/private/file.te
@@ -48,6 +48,9 @@
 # /data/misc/apexdata/com.android.art/staging
 type apex_art_staging_data_file, file_type, data_file_type, core_data_file_type;
 
+# /data/misc/apexdata/com.android.compos
+type apex_compos_data_file, file_type, data_file_type, core_data_file_type, apex_data_file_type;
+
 # /data/font/files
 type font_data_file, file_type, data_file_type, core_data_file_type;