nb/intel/haswell/northbridge.c: Drop stale comment

This can now be controlled with the `MMCONF_BUS_NUMBER` Kconfig option.

Change-Id: If0fdefc5b4339acc843443c551892b397ed39c2e
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58922
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/northbridge/intel/haswell/northbridge.c

@@ -34,10 +34,6 @@ static const char *northbridge_acpi_name(const struct device *dev)
 	return NULL;
 }
 
-/*
- * TODO: We could determine how many PCIe buses we need in the bar.
- *       For now, that number is hardcoded to a max of 64.
- */
 static struct device_operations pci_domain_ops = {
 	.read_resources    = pci_domain_read_resources,
 	.set_resources     = pci_domain_set_resources,