WMMA grouped conv fwd large tensor extra flavors (#3582)

* Additional flavors for WMMA conv fwd large tensor

- added F16/BF16 clamp operation
- added F16/BF16 bias_clamp operation
- small modification to the device code to accomodate extra tensors

* changed strategy to handle GemmArgs array

* Adding generic instance

* Added generic instance to clamp and bias_clamp ops