soc: brcm: move init code from SYS_INIT to hooks

Replace SYS_INIT with SoC hooks and adapt SoC init code

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

soc/brcm/bcmvk/viper/Kconfig

@@ -6,8 +6,10 @@ config SOC_BCM58402_M7
 	select CPU_CORTEX_M7
 	select CPU_CORTEX_M_HAS_SYSTICK
 	select CPU_HAS_ARM_MPU
+	select SOC_EARLY_INIT_HOOK
 
 config SOC_BCM58402_A72
 	select ARM64
 	select CPU_CORTEX_A72
 	select ARM_ARCH_TIMER if SYS_CLOCK_EXISTS
+	select SOC_EARLY_INIT_HOOK

soc/brcm/bcmvk/viper/a72/soc.c

@@ -13,11 +13,8 @@
  * @brief Perform basic hardware initialization at boot.
  *
  * This needs to be run from the very beginning.
- * So the init priority has to be 0 (zero).
- *
- * @return 0
  */
-static int viper_init(void)
+void soc_early_init_hook(void)
 {
 	uint32_t key;
 	uint32_t data;
@@ -35,8 +32,4 @@ static int viper_init(void)
 	sys_write32(data, LS_ICFG_PMON_LITE_SW_RESETN);
 
 	irq_unlock(key);
-
-	return 0;
 }
-
-SYS_INIT(viper_init, PRE_KERNEL_1, 0);

soc/brcm/bcmvk/viper/m7/soc.c

@@ -13,11 +13,8 @@
  * @brief Perform basic hardware initialization at boot.
  *
  * This needs to be run from the very beginning.
- * So the init priority has to be 0 (zero).
- *
- * @return 0
  */
-static int viper_init(void)
+void soc_early_init_hook(void)
 {
 	uint32_t data;
 
@@ -29,8 +26,4 @@ static int viper_init(void)
 	data = sys_read32(LS_ICFG_PMON_LITE_SW_RESETN);
 	data |= PCIE_PMON_LITE_SW_RESETN;
 	sys_write32(data, LS_ICFG_PMON_LITE_SW_RESETN);
-
-	return 0;
 }
-
-SYS_INIT(viper_init, PRE_KERNEL_1, 0);