arch: rx: Add simple sys_arch_reboot for RX architecture

Add simple sys_arch_reboot for RX architecture to conduct CI

Signed-off-by: Duy Nguyen <duy.nguyen.xa@renesas.com>

Author: duynguyenxa

arch/rx/core/CMakeLists.txt

@@ -12,6 +12,7 @@ zephyr_library_sources(
   vects.c
   isr_exit.S
   fatal.c
+  reboot.c
 )
 
 zephyr_library_sources_ifdef(CONFIG_IRQ_OFFLOAD irq_offload.c)

arch/rx/core/reboot.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ * @brief RX reboot interface
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/arch/cpu.h>
+#include <zephyr/sys/util.h>
+
+/**
+ * @brief Reset the system
+ *
+ * This is stub function to avoid build error with CONFIG_REBOOT=y
+ * RX specification does not have a common interface for system reset.
+ * Each RX SoC that has reset feature should implement own reset function.
+ */
+
+void __weak sys_arch_reboot(int type)
+{
+	ARG_UNUSED(type);
+}