Split out DocumentFile out of core-utils.

Bug: 73133409
Test: ./gradlew assembleDebug
Change-Id: Iea0f8a354bf97d6d1e3cf5afd45bae0a8806869b

diff --git a/settings.gradle b/settings.gradle
index 29fda13..3e0e54b 100644
--- a/settings.gradle
+++ b/settings.gradle

@@ -41,6 +41,7 @@
 includeProject(":coordinatorlayout", "coordinatorlayout")
 includeProject(":customtabs", "customtabs")
 includeProject(":customview", "customview")
+includeProject(":documentfile", "documentfile")
 includeProject(":drawerlayout", "drawerlayout")
 includeProject(":exifinterface", "exifinterface")
 includeProject(":gridlayout-v7", "v7/gridlayout")