hw: Move ich9.h to southbridge/

ICH9 is a south bridge which doesn't necessarily depend on x86, so move
it into the southbridge folder, analoguous to PIIX.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230213173033.98762-13-shentey@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 1bb73c3..d27921f 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -55,10 +55,10 @@
 #include "hw/hyperv/vmbus-bridge.h"
 
 /* Supported chipsets: */
+#include "hw/southbridge/ich9.h"
 #include "hw/southbridge/piix.h"
 #include "hw/acpi/pcihp.h"
 #include "hw/i386/fw_cfg.h"
-#include "hw/i386/ich9.h"
 #include "hw/i386/pc.h"
 #include "hw/pci/pci_bus.h"
 #include "hw/pci-host/i440fx.h"