Add a removed_package module type

Because you can add non-existent packages to PRODUCT_PACKAGES, it
was requested to have a removed_package module type that can throw
an error if it is accidentally included in PRODUCT_PACKAGES.

You can't do this with just a c binary with a `#error` line because
checkbuild will attempt to build it.

Test: Manually
Change-Id: I25257dc90c1d93427112ec5d283f4d67e23174ee