arch/risc-v: fix break on kernel mode

merge conflicts lead to incorrect ifdef/endif scope

Signed-off-by: chao an <anchao@lixiang.com>

arch/risc-v/src/qemu-rv/qemu_rv_start.c

@@ -117,12 +117,13 @@ void qemu_rv_start(int mhartid, const char *dtb)
 
 #ifndef CONFIG_BUILD_KERNEL
   qemu_rv_clear_bss();
-#endif
 
 #ifdef CONFIG_RISCV_PERCPU_SCRATCH
   riscv_percpu_add_hart(mhartid);
 #endif
 
+#endif
+
 #ifdef CONFIG_DEVICE_TREE
   fdt_register(dtb);
 #endif