[ Merge from http://go/wvgerrit/16499 ]
Passing clear subsamples to OEMCrypto_CopyBuffer and encrypted subsamples
to OEMCrypto_DecryptCTR was causing performance issues as a lack of crypto
session information made it hard to associate clear and encrypted
subsamples with each other.
[ Based on a patch from Kelly Ren/Qualcomm ]
b/26538744
Change-Id: I4644f197b2ec481f6aa89d3fce29b22ebb7b0c06