Camera: Fix delay in service registration

We have encountered a problem where the registration of another service
that is referencing the CameraService is delayed
when registering it as a service.

Like HIDL case, Changing to checkService can help resolve the delay issue
that occur during the registration of services

Bug: 317153705
Test: manual test with device
Change-Id: Ib04a03f13ce468495c71d616708723cd7cb565f3