Push ISA features into system properties

We need to know instruction set featues at runtime as well so that the
apps get compiled on target with the proper features. The properties are
read by installd and passed to dex2oat.

Bug: 16716262

(cherry picked from commit 28be9d88)

Change-Id: I45b363558dea17e9b049e4a83a55990b4911d9d8