bsp:ls2k:add reboot and power command

bsp/ls2kdev/applications/pmcon.c

@@ -0,0 +1,15 @@
+#include <rtthread.h>
+
+static void reboot()
+{
+	rt_hw_cpu_reset();
+}
+MSH_CMD_EXPORT(reboot, reboot sample);
+
+
+static void poweroff()
+{
+	rt_hw_cpu_shutdown();
+}
+MSH_CMD_EXPORT(poweroff, shutdown power sample);
+