Fixes 2422  (#2423)
Fixes 2422  (#2423)

* When gemm is enabled, do not return w/o checking implicit gemm workspace size

* Address code review comment

* Updated code to retain old workspace computation while adding implicit gemm on top of it

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