hw/ppc/ppc4xx_pci: Move ppc4xx_pci.c to hw/pci-host/

ppc4xx_pci.c is moved from the target specific ppc_ss[] meson
source set to pci_ss[] which is common to all targets: the
object is built once.

Declare PPC4XX_PCI selector in pci-host/Kconfig.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20240215105017.57748-4-philmd@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 9b6ce9a..8d9ccd5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1423,6 +1423,7 @@
 L: qemu-ppc@nongnu.org
 S: Orphan
 F: hw/ppc/ppc440_bamboo.c
+F: hw/pci-host/ppc4xx_pci.c
 F: tests/avocado/ppc_bamboo.py
 
 e500