Move from dalvik.vm.image-dex2oat-flags to dalvik.vm.dex2oat-filter [frameworks/base]

This will allow us to conditionally change the compiler-filter based on other properties.

Bug: 15165413

(cherry picked from commit f60d3a47)

Change-Id: I293c81ba817e9abbf9c05b3fb554ef2f0ad0c4ed