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 45355508)
(cherry picked from commit e5207cd9)