Track allowed transitive deps in any updatable module.

Instead of tracking per module and per module variant, track allowed
list of dependecies for all modules combined. This avoids issues with
different products and different downstream branches having different
build graphs.

To compare allowed_deps.txt vs head, run:
:; m -j out/soong/apex/depsinfo/new-allowed-deps.txt.check

To update source allowed_deps.txt, run:
:; build/soong/scripts/update-apex-allowed-deps.sh

Bug: 149622332
Test: m
Change-Id: Ic518fbd9ebfe1b46aaf9a58df731780a7e5a676b
Merged-In: Ic518fbd9ebfe1b46aaf9a58df731780a7e5a676b
(cherry picked from commit 453555083b86ff35d874df08f68bf6252fc12fd1)
(cherry picked from commit e5207cd9a62f0cf521e95257720529392134a603)
diff --git a/apex/OWNERS b/apex/OWNERS
index a382ae8..793f3ed 100644
--- a/apex/OWNERS
+++ b/apex/OWNERS
@@ -1 +1,4 @@
-per-file * = jiyong@google.com
\ No newline at end of file
+per-file * = jiyong@google.com
+
+per-file allowed_deps.txt = set noparent
+per-file allowed_deps.txt = dariofreni@google.com,hansson@google.com,harpin@google.com,jiyong@google.com,narayan@google.com,omakoto@google.com,jham@google.com