riscv: delay.c:77:17: error: implicit declaration of function 'cpu_relax' [-Werror=implicit-function-declaration]

[Kefeng Wang]

 From c83a7b83ff96ba77a7c26090ccdd42aa7722788f Mon Sep 17 00:00:00 2001
From: Kefeng Wang <wangkefeng.wang at huawei.com>
Date: Thu, 28 Oct 2021 23:03:13 +0800
Subject: [PATCH] riscv: Fix implicit declaration of function 'cpu_relax'

Including <asm/processor.h> to fix the implicit declaration of function
'cpu_relax'.

Reported-by: Linux Kernel Functional Testing <lkft at linaro.org>
Signed-off-by: Kefeng Wang <wangkefeng.wang at huawei.com>
---
After  "include/linux/delay.h: replace kernel.h with the necessary 
inclusions", we need this include.

  arch/riscv/lib/delay.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/arch/riscv/lib/delay.c b/arch/riscv/lib/delay.c
index f51c9a03bca1..8148dcdee894 100644
--- a/arch/riscv/lib/delay.c
+++ b/arch/riscv/lib/delay.c
@@ -8,6 +8,8 @@
  #include <linux/timex.h>
  #include <linux/export.h>

+#include <asm/processor.h>
+
  /*
   * This is copies from arch/arm/include/asm/delay.h
   *
-- 
2.26.2