nb/intel/gm45: Get rid of device_t

Use of `device_t` has been abandoned in ramstage.

Change-Id: If064a4027265e8fc2ea919d9742a554abf29b8db
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/23667
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/northbridge/intel/gm45/gm45.h b/src/northbridge/intel/gm45/gm45.h
index df9c449..56c6fea 100644
--- a/src/northbridge/intel/gm45/gm45.h
+++ b/src/northbridge/intel/gm45/gm45.h
@@ -448,7 +448,7 @@
 #include <device/device.h>
 
 struct acpi_rsdp;
-unsigned long northbridge_write_acpi_tables(device_t device, unsigned long start, struct acpi_rsdp *rsdp);
+unsigned long northbridge_write_acpi_tables(struct device *device, unsigned long start, struct acpi_rsdp *rsdp);
 #endif
 
 #endif /* !__ACPI__ */