Add call to onBootPhase to tests that use HdmiControlService

Some system services are accessed and cached in a call to
HdmiControlService#onBootPhase(SystemService#SYSTEM_SERVICES_READY).
Since a lot of the code in the HDMI framework accesses other system
services, tests that use HdmiControlService may cause null pointer
exceptions as the codebase changes. This CL proactively adds this
call to avoid future breakages.

Test: atest com.android.server.hdmi
Bug: 205817707
Change-Id: I684d188e563ff9089deacd1009f511e50a08f255