IServiceManager: remove onRegistration todo

This would introduce a second way to retrieve a service. Since we
already handle situations where a service dies in-between 'get' and
the 'onRegistration' notification, it makes sense to continue doing
this and not introduce additional complexity into hwservicemanager.

Bug: 66921961
Test: N/A
Change-Id: Ifc29b1b4e0eb45079be85c41f8d0ce012eff60b2
1 file changed