libbinder: size checks for Parcel+IBinder

(the ones for Parcel are just improved)

These types are used in prebuilts, so it's useful to know the size
changes w/ having to wait for DOA devices.

Bug: 166282674
Test: build only (these are compile-time checks)
Change-Id: Ib6deda78a3f2bf537b3163ae7ea5a703b1c8e289