mb/emulation/qemu-q35: Get rid of device_t

Change-Id: I74461e75abce6cdd0c7a16b3a6589de3486a1a3f
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/26492
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/mainboard/emulation/qemu-q35/acpi_tables.c

@@ -195,7 +195,7 @@ unsigned long acpi_fill_madt(unsigned long current)
 
 unsigned long acpi_fill_mcfg(unsigned long current)
 {
-	device_t dev;
+	struct device *dev;
 	u32 reg;
 
 	dev = dev_find_device(0x8086, 0x29c0, 0);