IDrmClient: remove Parcel from interface

This is part of the effort to remove binder-related classes from libmediadrm.
This change replaces a generic listener for Parcel data with separate
listeners for each event type.

Bug: 134787536
Test: MediaDrmClearkeyTest
Test: NativeMediaDrmClearkeyTest
Test: MediaDrmMockTest
Change-Id: I90cbb75b21cc63737994a01a2171caee5cfb84ad