src: Remove duplicated includes

Change-Id: If8c7e26ebd954b19bfb8766b26570c6865ad255e
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41676
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/fizz/mainboard.c

@@ -10,7 +10,6 @@
 #include <ec/google/chromeec/ec.h>
 #include <gpio.h>
 #include <intelblocks/power_limit.h>
-#include <variant/gpio.h>
 #include <smbios.h>
 #include <soc/gpio.h>
 #include <soc/pci_devs.h>