example of conv bwd weight 1d/2d/3d fp32/fp16/bf16 xdl (#244)

* enable example of conv 1d/3d for bwd weight

* make bf16 kernel do not use atomic add

* using new gridwise gemm for bwd weight on convnd bwd weight

Co-authored-by: Chao Liu <chao.liu2@amd.com>

include/ck/tensor_operation/gpu/device/convolution_backward_weight_specialization.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+namespace ck {
+namespace tensor_operation {
+namespace device {
+
+enum struct ConvolutionBackwardWeightSpecialization
+{
+    Default,
+    Filter1x1Stride1Pad0,
+    Filter1x1Pad0,
+    OddC,
+};
+
+} // namespace device
+} // namespace tensor_operation
+} // namespace ck