Automatically add system and system_ext autogen RRO to vendor/product

This CL creates a dependency edge from vendor/product to system and
system_ext. A post deps mutator will walk the transitive closure and add
the corresponding autogenerated RROs to deps.

Bug: 374371755
Bug: 375277835

Test: m soong_generated_vendor_filesystem_test
NOTICE is the last diff

Change-Id: Iffe64174a0d639dc224505a08eccd0a1dedc9f39