Use libbase API to access system properties in libhwui

Calls to licutils properties API are replaced by calls to libbase
properties API. This will make it easier to make a host target for
libhwui as libbase provides a host implementation for its properties
API.

Bug: 117921091
Test: N/A
Change-Id: I15b4fe1a16d2bc7b271387d8cf3403940b8aae2d