hw/pci-host: Rename incorrectly named 'piix' as 'i440fx'

We moved all the PIIX3 southbridge code out of hw/pci-host/piix.c,
it now only contains i440FX northbridge code.
Rename it to match the chipset modelled.

Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

MAINTAINERS

@@ -1241,7 +1241,7 @@ M: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
 S: Supported
 F: include/hw/i386/
 F: hw/i386/
-F: hw/pci-host/piix.c
+F: hw/pci-host/i440fx.c
 F: hw/pci-host/q35.c
 F: hw/pci-host/pam.c
 F: include/hw/pci-host/i440fx.h

hw/i386/Kconfig

@@ -60,7 +60,7 @@ config I440FX
     select PC_PCI
     select PC_ACPI
     select ACPI_SMBUS
-    select PCI_PIIX
+    select PCI_I440FX
     select PIIX3
     select IDE_PIIX
     select DIMM

hw/pci-host/Kconfig

@@ -28,7 +28,7 @@ config PCI_SABRE
     select PCI
     bool
 
-config PCI_PIIX
+config PCI_I440FX
     bool
     select PCI
     select PAM

hw/pci-host/Makefile.objs

@@ -13,7 +13,7 @@ common-obj-$(CONFIG_VERSATILE_PCI) += versatile.o
 
 common-obj-$(CONFIG_PCI_SABRE) += sabre.o
 common-obj-$(CONFIG_FULONG) += bonito.o
-common-obj-$(CONFIG_PCI_PIIX) += piix.o
+common-obj-$(CONFIG_PCI_I440FX) += i440fx.o
 common-obj-$(CONFIG_PCI_EXPRESS_Q35) += q35.o
 common-obj-$(CONFIG_PCI_EXPRESS_GENERIC_BRIDGE) += gpex.o
 common-obj-$(CONFIG_PCI_EXPRESS_XILINX) += xilinx-pcie.o