mainboard/gigabyte/*: transition away from device_t

Replace the use of the old device_t definition inside
mainboard/gigabyte/*.

Change-Id: Ied62d6234a4f6ea5f851e98a098b2c8f4e3db144
Signed-off-by: Antonello Dettori <dev@dettori.io>
Reviewed-on: https://review.coreboot.org/16439
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/gigabyte/ga-b75m-d3h/romstage.c b/src/mainboard/gigabyte/ga-b75m-d3h/romstage.c
index be6043a..dd889d1 100644
--- a/src/mainboard/gigabyte/ga-b75m-d3h/romstage.c
+++ b/src/mainboard/gigabyte/ga-b75m-d3h/romstage.c
@@ -33,7 +33,7 @@
 #include <arch/cpu.h>
 #include <cpu/x86/msr.h>
 
-static void it8728f_b75md3h_disable_reboot(device_t dev)
+static void it8728f_b75md3h_disable_reboot(pnp_devfn_t dev)
 {
 	/* GPIO SIO settings */
 	ite_reg_write(dev, 0xEF, 0x7E); // magic