share npu4 to npu2, 5, 6 #216
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NPU 2, 4, 5, 6 are from the same family. The only difference is firmware binary, PCIe revision ID.
Since NPU2 is the early prototype version, I move all of the shared code to npu4_family.h. The npu2 device might be obsoleted in the near future.
Ideally, after this change, if we have new data struct or macro to add, we should only update npu4_family.h and npu4_regs.c