[automerger] Decoder: Set prev slice type for I slice. am: aecdfd1aff am: 65db3cc9a3 am: 93e93983e1 am: 0f9ee33f0a am: 9d76581d46 am: 475e185a91 am: 16d1d4faa8

Change-Id: I07e28841de910a8bed34268fa4c0c573a4f3944e