soc: Kconfig: Add options for compatible NRF SOCs

Simulated NRF boards based on the POSIX ARCH cannot directly
use the current SOC_*NRF options as these pull options from
the ARM CPU and other peripherals.
This commit adds a new set of hidden SOC_COMPATIBLE_* options to
be selected both by the real SOCs and the simulated ones.
In this manner we can have the common code depend on the
SOC_COMPATIBLE* options instead of the current ones where
neccessary.

Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>

(f) arm kconfig

soc/Kconfig

@@ -16,3 +16,16 @@ module-str = SOC
 source "subsys/logging/Kconfig.template.log_config"
 
 endmenu
+
+# The helper symbols below are put here due to an unusual setup: The simulated
+# nrf52_bsim board uses the POSIX arch, but is compatible with Nordic ARM
+# boards
+
+config SOC_COMPATIBLE_NRF
+	bool
+
+config SOC_COMPATIBLE_NRF52X
+	bool
+
+config SOC_COMPATIBLE_NRF52832
+	bool