Expand the dexpreopt image dependencies to entire image

Instead of just depending on the main .art file (boot.art, etc), also
expose the dependencies to the .oat/.vdex files (boot.oat/boot.vdex),
and all of the module files that get implicitly loading (boot-ext.*,
boot-framework.*, etc)

This is necessary for RBE, where the rule only gets the files that it
depends upon.

Test: treehugger
Test: build a system image with RBE
Change-Id: I0c7051f18582f1891d3398b46763b1521e4326c8