ACPI / scan: Move bus operations and notification routines to bus.c

To reduce the size of scan.c and improve the readability of it, move
code related to device notification, the definitions of the ACPI bus
operations and the driver management code to drivers/acpi/bus.c.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --cc drivers/acpi/bus.c
Simple merge

diff --cc drivers/acpi/scan.c
Simple merge