hw/riscv/virt-acpi-build.c: Add APLIC in the MADT

hw/riscv/virt-acpi-build.c: Add APLIC in the MADT

Add APLIC structures for each socket in the MADT when system is configured
with APLIC as the external wired interrupt controller.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20231218150247.466427-8-sunilvl@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>