Fix packaging to use intermediate rather than installed files

Packaging steps should always use intermediate files rather than forcing
the modules to be installed first. This also lets us change the install
locations without changing the packaging.

Also switches to soong_zip instead of zip, which creates more
reproducible results.

Test: m dist gamecore; check out/dist/gamecore.zip
Change-Id: Icb189c61d4474decb720085a1d92cb90e615b5ed
1 file changed