[Triton] DotOperandEncodingAttr verifier expects kwidth to be unset (defaulted to 0) when the parent is Blocked layout. Parent uses Blocked layout when Tensor Cores are disabled. This change fixes a constructor that doesn't respect this constraint.
[Triton] DotOperandEncodingAttr verifier expects kwidth to be unset (defaulted to 0) when the parent is Blocked layout. Parent uses Blocked layout when Tensor Cores are disabled. This change fixes a constructor that doesn't respect this constraint.
