soc: ene: 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/ene/kb1200/Kconfig

@@ -7,3 +7,4 @@ config SOC_KB1200
 	select CPU_HAS_ARM_MPU
 	select CPU_CORTEX_M_HAS_DWT
 	select CPU_HAS_FPU
+	select SOC_EARLY_INIT_HOOK

soc/ene/kb1200/soc.c

@@ -39,11 +39,8 @@ static void clock_init(void)
 	}
 }
 
-static int kb1200_init(void)
+void soc_early_init_hook(void)
 {
 	clock_init();
 	pmu_init();
-	return 0;
 }
-
-SYS_INIT(kb1200_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);