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1042: embassy-nrf: Add SPIS module r=Dirbaio a=kalkyl Verified to be working on nrf9160 Co-authored-by: Henrik Alsér <henrik.alser@me.com> Co-authored-by: Henrik Alsér <henrik.alser@ucsmindbite.se> Co-authored-by: kalkyl <henrik.alser@me.com>