Make inherit-product loop over all files passed to it

Currently inherit-product and the rest of the product
configuration infrastructure does not handle wildcards.
However, they still get passed through unchanged, until
they reach the raw Make include statement, which expands
them. This essentially makes a meta-product that is the
result of combining all the makefiles that were matched.

In Starlark, the behavior is to actually treat each file
as it's own product. This causes a discrepency when using
`m product-graph`, where make shows one node for all those
files and Stalark has a node for each.

This is probably unintentional behavior, so change Make
to also import each file as separate products. On the
product I was investigating, the only difference this
made in the ninja file was in the product graph.

Bug: 221312856
Test: Presubmits
Change-Id: I9ca7aff0b0790aeb6e42861ce2745feed8a1a7c4