Wait for camera extensions service during initialization

During Camera2 Extensions initialization we need to check
if the Camera Extensions Proxy service supports advanced
extensions. Now we're not only waiting
for the service to connect but were also waiting for
the query for advanced extensions to finish.

Fixes: 198818625
Change-Id: I8040eab80a4b97f77b551152b3f76f93f9b8af88
1 file changed