Compile secondary dex files during background dexopt job

Extend the backgound dexopt job to compile secondary dex files when
"dalvik.vm.deopt.secondary" system property is set to true.

Test: adb shell cmd package bg-dexopt-job
Bug: 32871170
Change-Id: If3a4b77f785e92c7f2f7869e25ff9b99904f165a