CUTLASS 2.6.1 - functional and performance enhancements to strided DGRAD, fixes, and tuning

* cutlass 2.6 update

* remove debug prints

* cutlass 2.6.1 (minor update)

* Updated CHANGELOG.

* Minor edit to readme to indicate patch version.

* Minor edit to readme.

Co-authored-by:  Haicheng Wu <haichengw@nvidia.com>, Andrew Kerr <akerr@nvidia.com>

include/cutlass/conv/device/implicit_gemm_convolution.h

@@ -217,14 +217,6 @@ public:
       if (result != cudaSuccess) {
         return Status::kErrorInternal;
       }
-
-      result = cudaFuncSetAttribute(
-          cutlass::Kernel<ImplicitGemmKernel>,
-          cudaFuncAttributePreferredSharedMemoryCarveout, 100);
-
-      if (result != cudaSuccess) {
-        return Status::kErrorInternal;
-      }
     }
     
     return Status::kSuccess;