init: replace property_get with its android::base equivalent

Slowly try to decouple property_service.cpp from the rest of init.

Test: Boot bullhead
Change-Id: I267ae0b057bca0bf657b97cb8bfbb18199282729
(cherry picked from commit ccf23537eeacfa47e5f18dd3b75089886d177c1b)
11 files changed