Revert "Introduce app_data_file_type attribute."

This reverts commit 27e0c740f1894e9a390b7105255eb29401d25c35.

Reason for revert: b/172926597

Change-Id: Id2443446cbdf51dc05b303028377895b9cf2a09e
diff --git a/private/seapp_contexts b/private/seapp_contexts
index dedc315..487a577 100644
--- a/private/seapp_contexts
+++ b/private/seapp_contexts
@@ -79,8 +79,7 @@
 # domain= determines the label to be used for the app process; entries
 # without domain= are ignored for this purpose.
 # type= specifies the label to be used for the app data directory; entries
-# without type= are ignored for this purpose. The label specified must
-# have the app_data_file_type attribute.
+# without type= are ignored for this purpose.
 # levelFrom and level are used to determine the level (sensitivity + categories)
 # for MLS/MCS.
 # levelFrom=none omits the level.