net: dsa: realtek: rename macro to match filename

The macro was missed while renaming realtek-smi.h to realtek.h.

Fixes: f5f11907 (net: dsa: realtek: rename realtek_smi to)
Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Acked-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/realtek/realtek.h

@@ -5,8 +5,8 @@
  * Copyright (C) 2009-2010 Gabor Juhos <juhosg@openwrt.org>
  */
 
-#ifndef _REALTEK_SMI_H
-#define _REALTEK_SMI_H
+#ifndef _REALTEK_H
+#define _REALTEK_H
 
 #include <linux/phy.h>
 #include <linux/platform_device.h>
@@ -142,4 +142,4 @@ void rtl8366_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *data);
 extern const struct realtek_variant rtl8366rb_variant;
 extern const struct realtek_variant rtl8365mb_variant;
 
-#endif /*  _REALTEK_SMI_H */
+#endif /*  _REALTEK_H */