Moving CryptoInfo creation for Unencrypted samples

BLOCK_MODEL CryptoInfos for unencrypted samples are now created in
mediacodec. This now operates in the same way as in the normal mode.

Bug: 325512893
Test: atest android.mediav2.cts.CodecDecoderDrmTest
Test: atest android.mediav2.cts.CodecDecoderMultiAccessUnitDrmTest
Change-Id: I5a86348042748de080c7afde5eb9ce27ed35fabd