add nkmcu

hc

2023-11-06 170c1c0fa90ad9f762d1877f8a57efce706fc95a

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nvkm-y += nvkm/subdev/mxm/base.o
nvkm-y += nvkm/subdev/mxm/mxms.o
nvkm-y += nvkm/subdev/mxm/nv50.o