hw/isa/lpc_ich9: Remove unused 'hw/i386/pc.h'

Commit c461f3e ("hw/acpi/acpi_dev_interface: Remove now unused
madt_cpu virtual method") removed the need for "hw/i386/pc.h".

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Luc Michel <luc.michel@amd.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/isa/lpc_ich9.c

@@ -41,7 +41,6 @@
 #include "hw/isa/apm.h"
 #include "hw/pci/pci.h"
 #include "hw/southbridge/ich9.h"
-#include "hw/i386/pc.h"
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/ich9.h"
 #include "hw/pci/pci_bus.h"