soc: nordic: add support of 'iron' variant to application

- use early init hook instead of nrf92_init.
- add config flag for iron variant.

Signed-off-by: Aymen LAOUINI <aymen.laouini@nordicsemi.no>

Author: ayla-nordicsemi

soc/nordic/nrf92/Kconfig

@@ -7,6 +7,7 @@ config SOC_SERIES_NRF92X
 	select HAS_NRFS
 	select HAS_NRFX
 	select HAS_NORDIC_DRIVERS
+	select SOC_EARLY_INIT_HOOK if ARM
 	select NRF_PLATFORM_HALTIUM
 
 config SOC_NRF9230_ENGB_CPUAPP
@@ -48,3 +49,6 @@ config SOC_NRF9230_ENGB_CPURAD
 
 config SOC_NRF9230_ENGB_CPUPPR
 	select RISCV_CORE_NORDIC_VPR
+
+config SOC_NRF9280_IRON
+	select EXPERIMENTAL if MCUBOOT

soc/nordic/nrf92/Kconfig.soc

@@ -62,5 +62,10 @@ config SOC_NRF9280_CPUPPR
 	help
 	  nRF9280 CPUPPR
 
+config SOC_NRF9280_IRON
+	bool
+	help
+	  Indicates that local domain firmware is compatible with Nordic IRONside SE.
+
 config SOC
 	default "nrf9280" if SOC_NRF9280

soc/nordic/nrf92/soc.c

@@ -84,7 +84,7 @@ static int trim_hsfll(void)
 	return 0;
 }
 
-static int nordicsemi_nrf92_init(void)
+void soc_early_init_hook(void)
 {
 	sys_cache_instr_enable();
 	sys_cache_data_enable();
@@ -102,13 +102,9 @@ static int nordicsemi_nrf92_init(void)
 
 	nrf_spu_periph_perm_dmasec_set(spu, nrf_address_slave_get(ccm030_addr), true);
 #endif
-
-	return 0;
 }
 
 void arch_busy_wait(uint32_t time_us)
 {
 	nrfx_coredep_delay_us(time_us);
 }
-
-SYS_INIT(nordicsemi_nrf92_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);