Make uncompressDex available for use through hiddenAPIModule

In order for the bootclasspath_fragment to perform dex encoding on its
contents it needs to know whether the dex file is uncompressed or not.
This change makes that information available by passing it to
initHiddenAPI, storing it in hiddenAPI struct and providing access
through the hiddenAPIModule.

Bug: 179354495
Test: m droid
Change-Id: I913416b4836766de194203fd8ed5124b61dfa3dd