soc/intel/xeon_sp: Prefer include <soc/gpio.h> via <gpio.h>

Change-Id: I950b8859b51fb61edc0cf1115f6665378bc0b836
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82887
Reviewed-by: Shuo Liu <shuo.liu@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/xeon_sp/gnr/chip.h

@@ -5,7 +5,7 @@
 
 #include <intelblocks/cfg.h>
 #include <soc/acpi.h>
-#include <soc/gpio.h>
+#include <gpio.h>
 #include <soc/irq.h>
 #include <stdint.h>