Define file_diff allowlist for the next builds.

The current allowlist is based on trunk build configuration. the next
configuration may have more diffs. Define more allowlist for the next
build.

The allowlist can be empty when trunk goes to next.

Bug: 346873717
Test: lunch aosp_cf_x86_64_phone-next-userdebug && m
Change-Id: I47642c6b6f564b041914bccf192a9d9295eb3da0
diff --git a/tools/filelistdiff/Android.bp b/tools/filelistdiff/Android.bp
index ab766d6..3826e50 100644
--- a/tools/filelistdiff/Android.bp
+++ b/tools/filelistdiff/Android.bp
@@ -24,4 +24,9 @@
 prebuilt_etc_host {
     name: "system_image_diff_allowlist",
     src: "allowlist",
-}
\ No newline at end of file
+}
+
+prebuilt_etc_host {
+    name: "system_image_diff_allowlist_next",
+    src: "allowlist_next",
+}