AML: Replace ParceledListSlice

This CL creates a new class named MediaParceledListSlice that
replaces ParceledListSlice. MediaParceledListSlice is mostly copied
from ParcelImplListSlice.java with a few adjustments:
  1) not specifying type of parcelable (to work for both
     MediaSession.QueueItem & MediaBrowser.Mediaitem)
  2) Setting parameter to null for calling Parcel#readParcelable.
     Parcel retrieves the class loader inside readParcelableCreator.

Bug: 119750807
Test: mmm . (under frameworks/av/packages/MediaComponents)
Change-Id: If234308724ba132140089835e66b3948aacc4e57