clearkey hidl CryptoPlugin: misc & security fixes

* propagate decrypt error message
* reject native handle output
* validate subsample sizes

Bug: 137283376
Test: cryptopoc
Change-Id: Ic4267fdc0e391bdecc1caab3b8fd4aa34ad76541
(cherry picked from commit d23bd2a2a80f6bfc8c827bf21e53ad4500582d56)
1 file changed