Camera VTS: Wait for camera provider to become active

Use "AServiceManager_waitForService" instead of
"AServiceManager_getService" to wait for any camera
providers that might be using the lazy mechanism and
are not running all the time.

Bug: 297965980
Test: atest VtsAidlHalCameraProvider_TargetTest

Change-Id: I6374dc768cd1068885668f927f902dcee44a7a42