Revert "init: handle property service callbacks asynchronously"

This is apparently causing problems with reboot.

This reverts commit d2dab830.

Bug: 150863651
Test: build
Merged-In: Ib8a4835cdc8358a54c7acdebc5c95038963a0419
Change-Id: Ib8a4835cdc8358a54c7acdebc5c95038963a0419