f2fs: set pin_file under CAP_SYS_ADMIN

Android uses pin_file for uncrypt during OTA, and that should be managed by
CAP_SYS_ADMIN only.
Reviewed-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -2873,8 +2873,8 @@ static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
 	__u32 pin;
 	int ret = 0;
 
-	if (!inode_owner_or_capable(inode))
-		return -EACCES;
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
 
 	if (get_user(pin, (__u32 __user *)arg))
 		return -EFAULT;