Wait for property to be created

In order to hide KM initialization time, KM should be able to start
early and wait for system property to be created.

Bug: 80507323
Test: Build and boot
Merged-In: Ied636970b2b5832ec2bcc683335a59d4ace18e7c
Change-Id: Ied636970b2b5832ec2bcc683335a59d4ace18e7c
2 files changed