Compared with board_config.mk and found this one is missing.
Also add docs to explain where are these values from.
Test: pass
Change-Id: Ic22d75a538657bd286edcae6d95f9ee462911975
Instead of checking META/{system,vendor}_{manifest,matrix}.xml (which
is error-prone because ODM SKU-specific manifests are not checked),
this script read the target files package, remaps its directory
structure so that checkvintf understands it, and check VINTF
compatibility.
Also, put it in otatools.zip.
Test: run it on an extracted target files package
Bug: 131425279
Change-Id: I06036f9a8d7242d4bc11524028be40e780c508e8
