dexpreopt package.
Preparation for a future CL that will need to get the make-written
GlobalConfig from within dexpreopt.
Also rename the Load*Config functions to Parse*Config, since they don't
actually load the config files anymore.
This relands https://r.android.com/1211982.
Bug: 145934348
Test: m
Change-Id: Icb9332a93811d77d2d8b06e983b92501b180a358