[PATCH] x86_coco_sev: Fix build warnings about export.h

[“ChengZhenghan”]

From: ChengZhenghan <chengzhenghan@xxxxxxxxxxxxx>

I got a build warning with W=1:
arch/x86/coco/sev/core.c:
warning: EXPORT_SYMBOL() is used,
but #include <linux/export.h> is missing
so I fixed the build warning for x86_64.

Signed-off-by: ChengZhenghan <chengzhenghan@xxxxxxxxxxxxx>
---
 arch/x86/coco/sev/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c
index b6db4e0b936b..4b5d41bdd58d 100644
--- a/arch/x86/coco/sev/core.c
+++ b/arch/x86/coco/sev/core.c
@@ -20,6 +20,7 @@
 #include <linux/mm.h>
 #include <linux/cpumask.h>
 #include <linux/efi.h>
+#include <linux/export.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/psp-sev.h>
-- 
2.47.2