Revert "runtime: dexroot-on-cache: obey dalvik.vm.dexopt-data-only"

This reverts commit 2bd3da0ac368071a5c857f2123e3a3a3bc608741.
Revert "runtime: Add support for dexroot-on-cache"

This reverts commit b1eca8d3d8c4c3f50fc9bb1fb4875ab0def82865.