Libcore: Refactor hardcoded system properties

Refactor where and how (static) hardcoded system properties are
stored. This refactor will allow the compiler to serve these
properties during compile-time initialization.

Bug: 27265238
Bug: 28174137

(cherry picked from commit 59ae74317d957baae6e1a52deadfd96b1c6698cc)

Change-Id: I1fccf7558d085542dd710aa98ecdb61ae8fcabf2
3 files changed