Add HardwareRenderer to libhwui on host

This adds android_graphics_HardwareRenderer and related classes to the
host build of libhwui. This creates a platform dependent way of loading
symbols from a shared library to link back to Surface.

Bug: 322360037
Test: build libhwui on host
Change-Id: Ib8e9aca5ed97e730fc9de403a5fe71f7c3dc7200