Add hwbinder library

HAL impls will depend hwbinder.jar instead of framework.jar on
build-time, but on runtime framework.jar will be used.

This is to cut the circular dependency when using configstore from
Android framework. Also added JNI call to HwBinder.java to cut
configstore's dependency on systemproperty in framework.jar.

Note that hwbinder.jar is LOCAL_UNINSTALLABLE_MODULE and so it won't be
installed in an actual image.

Bug: 35771640
Test: build & run
Change-Id: I2420298cf9df5d6bbcead3e4451b703ce9bc3e29