mainboard: Remove duplicated <soc/gpio.h>

<gpio.h> chain-include <soc/gpio.h>.

Change-Id: Ia57d5cd33c70b6a755babd4db56c64c0e3666f9f
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71817
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/mainboard/google/fizz/mainboard.c

@@ -12,7 +12,6 @@
 #include <gpio.h>
 #include <intelblocks/power_limit.h>
 #include <smbios.h>
-#include <soc/gpio.h>
 #include <soc/pci_devs.h>
 #include <soc/nhlt.h>
 #include <string.h>