Remove unneeded notify AIDL API

Removes the notifyImsFeatureReady
API AIDL, it is called when the callback
is set on the specific ImsFeature
interface.

Bug: 74391574
Test: Manual
Merged-In: I4762bdef59a8adec8ce41972489c65f2d180a3d4
Change-Id: I8c9cc39fa73861d7a9792709e1517d391230abfa
2 files changed