This causes the driver to create proper device symlinks in sysfs when
new IDs are added and thus new devices found by the driver.

drivers/base/bus.c
    make driver_attach non-static
drivers/pci/pci-driver.c
    delete probe_each_pci_dev, call driver_attach instead.
    Whitespace cleanups.
include/linux/device.h
    add declaration of driver_attach.