soc: openisa: 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/openisa/rv32m1/Kconfig

@@ -20,3 +20,4 @@ config SOC_OPENISA_RV32M1
 	select RISCV_ISA_EXT_C
 	select RISCV_ISA_EXT_ZICSR
 	select RISCV_ISA_EXT_ZIFENCEI
+	select SOC_EARLY_INIT_HOOK

soc/openisa/rv32m1/soc.c

@@ -218,7 +218,7 @@ static void rv32m1_setup_peripheral_clocks(void)
  *
  * @return 0
  */
-static int soc_rv32m1_init(void)
+void soc_early_init_hook(void)
 {
 	unsigned int key;
 
@@ -239,8 +239,4 @@ static int soc_rv32m1_init(void)
 	rv32m1_setup_peripheral_clocks();
 
 	irq_unlock(key);
-
-	return 0;
 }
-
-SYS_INIT(soc_rv32m1_init, PRE_KERNEL_1, 0);