support multiple template parameter in KernelType for REGISTER_OP_XPU…

[jacquesqiao]

for macro like:

#define REGISTER_OP_CPU_KERNEL(type, KenelType) \
...

if KenelType have more then one template parameter, like

REGISTER_OP_CPU_KERNEL(xx, XxClass<float, float>)

because there is a ,, it will cause error like

error: too many arguments provided to function-like macro invocation