add nk_io at24_eeprom driver

hc

2023-02-14 796a7ef0befd21e25c2b9e42f53a6d7a4421941d

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obj-$(CONFIG_XEN_BLKDEV_BACKEND) := xen-blkback.o
 
xen-blkback-y    := blkback.o xenbus.o