Fixed default BN from driver. Fixed BN driver wall and kernel times. Removed unnecessary iterations from fwd infer and bwd train.
Fixed default BN from driver. Fixed BN driver wall and kernel times. Removed unnecessary iterations from fwd infer and bwd train.

ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen