nb/intel/ironlake/northbridge.c: Fix overlapping resources

Fixed resources should not overlap.

Change-Id: I7a70f5475c1d701db2cb8cbea659bacf6d0c52ae
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49622
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/northbridge/intel/ironlake/northbridge.c b/src/northbridge/intel/ironlake/northbridge.c
index e01bf7d..9dc38ec 100644
--- a/src/northbridge/intel/ironlake/northbridge.c
+++ b/src/northbridge/intel/ironlake/northbridge.c
@@ -105,7 +105,7 @@
 
 	/* Report the memory regions */
 	ram_resource(dev, index++, 0, 0xa0000 / KiB);
-	ram_resource(dev, index++, 0xc0000 / KiB, (tseg_base - 0xc0000) / KiB);
+	ram_resource(dev, index++, 1 * MiB / KiB, (tseg_base - 1 * MiB) / KiB);
 
 	mmio_resource(dev, index++, tseg_base / KiB, CONFIG_SMM_TSEG_SIZE / KiB);