soc/amd: Drop acpi_fill_madt_irqoverride()

It is unused. The use of field irq is problematic as it should
appear relative to IOAPIC GSI bases in the devicetree.

Change-Id: I460fd5fde3a7fba5518ccfc153a266d097a95a39
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74357
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/soc/amd/phoenix/acpi.c

@@ -27,8 +27,6 @@ unsigned long acpi_fill_madt(unsigned long current)
 	current += acpi_create_madt_ioapic_from_hw((acpi_madt_ioapic_t *)current,
 						   GNB_IO_APIC_ADDR);
 
-	current = acpi_fill_madt_irqoverride(current);
-
 	return current;
 }