This commit adopts hw model v2 to nRF SoC family.
This ensures that when hw model v2 is used for an nRF51, nRF52, nRF53,
and nRF91 SoC series, so that all SoC selections are handled internally
by Kconfig, and no selection / re-configuration is possible by end-user
or through configuration files.
Hw model v2 requires the SoC to be self-contained, that is no
references are allowed out-side the SoC Kconfig tree.
All Zephyr Kconfig specifics are therefore sourced into the Zephyr
Kconfig tree through Kconfig.zephyr and Kconfig.zephyr.defconfig.
Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>
c79f1b0d94