Update calls to dexpreopt_gen

dexpreopt_gen now requires a -out_dir argument, and does not need
DexPath, StripInputPath and StripOutputPath set.

Also use paths to Soong binaries for dex2oat, profman and aapt
so that they can be loaded as Path objects in Soong, and let
Soong handle the default for BootImageProfiles.

This reapplies I97b1865fd98d5108d9c63ff7a90a5591c7622526 with
fixes to disable preopt for Soong-only builds when the global
dexpreopt.config doesn't exist.

Test: m checkbuild
Change-Id: I5af9b749235823b7e1cfcfc55e121bfec413fb2f