staging: exfat: replace printk(KERN_INFO ...) with pr_info()

Fix checkpatch.pl warning:

	WARNING: Prefer [subsystem eg: netdev]_info([subsystem]dev, ...
	then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
Signed-off-by: NRoi Martin <jroi.martin@gmail.com>
Link: https://lore.kernel.org/r/20191030010328.10203-5-jroi.martin@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/exfat/exfat_super.c

@@ -396,7 +396,7 @@ static int ffsMountVol(struct super_block *sb)
 	if (i < 53) {
 #ifdef CONFIG_EXFAT_DONT_MOUNT_VFAT
 		ret = -EINVAL;
-		printk(KERN_INFO "EXFAT: Attempted to mount VFAT filesystem\n");
+		pr_info("EXFAT: Attempted to mount VFAT filesystem\n");
 		goto out;
 #else
 		if (GET16(p_pbr->bpb + 11)) /* num_fat_sectors */