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/acpi.c b/src/northbridge/intel/gm45/acpi.c
index b90afca..73b098f 100644
--- a/src/northbridge/intel/gm45/acpi.c
+++ b/src/northbridge/intel/gm45/acpi.c
@@ -29,7 +29,7 @@
 
 unsigned long acpi_fill_mcfg(unsigned long current)
 {
-	device_t dev;
+	struct device *dev;
 	u32 pciexbar = 0;
 	u32 pciexbar_reg;
 	int max_buses;
@@ -105,7 +105,7 @@
 	return current;
 }
 
-unsigned long northbridge_write_acpi_tables(device_t device,
+unsigned long northbridge_write_acpi_tables(struct device *device,
 					    unsigned long start,
 					    struct acpi_rsdp *rsdp)
 {