rocBLAS integration for RNNs (#1306)
rocBLAS integration for RNNs (#1306)

* replaced first gemm call in rnnocl.cpp with rocblas

* issues with test_lstm and test_gru

* RNNForwardTraining complete

* RNNForwardInference completed

* RNNBackwardData works

* RNNBackwardWeights works

* minimize diffs from develop

* added wrapper around gemm decsriptors in RNNForwardInference

* encapsulate gemm descriptor creation

* remove MIOPENGEMM PATH

* use MIOPEN_LOG_E for errors

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