sb/amd/pi/hudson/acpi/fch: use VGA_MMIO_* defines

Replace the magic constants by using defines.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I3cb150aee8030d1a419f3596ddbc32cb29f65b52
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75664
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
diff --git a/src/southbridge/amd/pi/hudson/acpi/fch.asl b/src/southbridge/amd/pi/hudson/acpi/fch.asl
index 10f25a1..834b346 100644
--- a/src/southbridge/amd/pi/hudson/acpi/fch.asl
+++ b/src/southbridge/amd/pi/hudson/acpi/fch.asl
@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <arch/vga.h>
+
 /* System Bus */
 /*  _SB.PCI0 */
 
@@ -87,7 +89,7 @@
 		0xF300		/* length */
 	)
 
-	Memory32Fixed(READONLY, 0x000A0000, 0x00020000, VGAM)	/* VGA memory space */
+	Memory32Fixed(READONLY, VGA_MMIO_BASE, VGA_MMIO_SIZE, VGAM)	/* VGA memory space */
 	Memory32Fixed(READONLY, 0x000C0000, 0x00020000, EMM1)	/* Assume C0000-E0000 empty */
 
 	/* memory space for PCI BARs below 4GB */