added z tensor datatype choice for fwd pass

include/ck/tensor_operation/gpu/device/impl/device_batched_multihead_attention_forward_xdl_cshuffle.hpp

@@ -413,6 +413,7 @@ struct DeviceBatchedMultiheadAttentionForward_Xdl_CShuffle
     // GridwiseGemm
     using GridwiseGemm = GridwiseBatchedMultiheadAttentionForward_Xdl_CShuffle<
         ADataType, // TODO: distinguish A/B datatype
+        ZDataType,
         GemmDataType,
         GemmAccDataType,
         CShuffleDataType,

include/ck/tensor_operation/gpu/device/impl/device_grouped_multihead_attention_forward_xdl_cshuffle.hpp

@@ -424,6 +424,7 @@ struct DeviceGroupedMultiheadAttentionForward_Xdl_CShuffle
     // GridwiseGemm
     using GridwiseGemm = GridwiseBatchedMultiheadAttentionForward_Xdl_CShuffle<
         ADataType, // TODO: distinguish A/B datatype
+        ZDataType,
         GemmDataType,
         GemmAccDataType,
         CShuffleDataType,

include/ck/tensor_operation/gpu/grid/gridwise_batched_multihead_attention_forward_xdl_cshuffle.hpp

@@ -21,6 +21,7 @@
 namespace ck {
 
 template <typename FloatAB,
+          typename ZDataType,
           typename FloatGemm,
           typename FloatGemmAcc,
           typename FloatCShuffle,
@@ -424,7 +425,7 @@ struct GridwiseBatchedMultiheadAttentionForward_Xdl_CShuffle
                                const FloatAB* __restrict__ p_b_grid,
                                const FloatAB* __restrict__ p_b1_grid,
                                FloatC* __restrict__ p_c_grid,
-                               unsigned short* __restrict__ p_z_grid,
+                               ZDataType* __restrict__ p_z_grid,
                                FloatLSE* __restrict__ p_lse_grid,
                                void* __restrict__ p_shared,
                                const AElementwiseOperation& a_element_op,
@@ -876,7 +877,7 @@ struct GridwiseBatchedMultiheadAttentionForward_Xdl_CShuffle
 
         auto z_thread_copy_vgpr_to_global = ThreadwiseTensorSliceTransfer_v1r3<
             ushort,
-            ushort,
+            ZDataType,
             decltype(z_thread_desc_m0_n0_m1_n1_m2_n2_m3_n3_n4_n5),
             decltype(z_grid_desc_m0_n0_m1_n1_m2_n2_m3_n3_n4_n5),
             tensor_operation::element_wise::PassThrough,