dts: nordic: add binding and macro mapping for SPU

This commit contributes a binding .yaml file for Nordic nRF
SPU peripheral and defines the macro for the peripheral base
register address in file ext/hal/nordic/nrfx_config_nrf9160.h.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
2 files changed