nb/amd/pi/00730f01/northbridge: use VGA_MMIO_* defines

Replace the magic constants by using defines.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ie558de02cd4f8914409639a74c54b57df3418ed9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75665
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/amd/pi/00730F01/northbridge.c b/src/northbridge/amd/pi/00730F01/northbridge.c
index 355820a..116cf63 100644
--- a/src/northbridge/amd/pi/00730F01/northbridge.c
+++ b/src/northbridge/amd/pi/00730F01/northbridge.c
@@ -6,6 +6,7 @@
 #include <acpi/acpi.h>
 #include <acpi/acpi_ivrs.h>
 #include <arch/ioapic.h>
+#include <arch/vga.h>
 #include <types.h>
 #include <device/device.h>
 #include <device/pci.h>
@@ -139,7 +140,7 @@
 	 * 0xa0000 - 0xbffff: legacy VGA
 	 * 0xc0000 - 0xfffff: option ROMs and SeaBIOS (if used)
 	 */
-	mmio_resource_kb(dev, index++, 0xa0000 >> 10, (0xc0000 - 0xa0000) >> 10);
+	mmio_resource_kb(dev, index++, VGA_MMIO_BASE >> 10, VGA_MMIO_SIZE >> 10);
 	reserved_ram_resource_kb(dev, index++, 0xc0000 >> 10, (0x100000 - 0xc0000) >> 10);
 
 	if (fx_devs == 0)