Use dexpreopt image deps from Soong

Instead of just depending on the single image file, depend on the entire
image that gets loaded -- the .oat / .vdex files, and the modules that
are part of the image that have their own files.

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: I93a580b42cf4ef1824ee1397e551c065f083348a