Fix ctx.InstallFile calls for java modules

Call ctx.InstallFile on the primary install file last so that the
primary install file can depend on the extra install files, and so that
the primary install file can be inferred from the last installed file.

Add missing ctx.InstallFile calls for the dexpreopt and hostdex outputs.

Fix the install subdirectory for modules installing to the testcases
directory.

Bug: 204136549
Test: m checkbuild
Change-Id: I7edd7647be27439d3ca0ecc589ca5e89d4ba8474