AVC FEI: remove redundant sync for PreENC, ENC, PAK
AVC FEI: remove redundant sync for PreENC, ENC, PAK

vaSyncSurface guarantees that task is completed upon its return.
We don't need to recheck surface status

Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK