PCI: make pcibios_add_bus/remove_bus callbacks

These are mostly not architecture specific but are meant for particular
PCI host bridge implementations, in particular for the ACPI version.

Turn them both into callback functions that are implemented by the
APCI PCI implementation as well as the one architecture that overrides
pcibios_remove_bus.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
7 files changed