driver core: remove BUS_ATTR()

There are now no in-kernel users of BUS_ATTR() so drop it from device.h

Everyone should use BUS_ATTR_RO/RW/WO() from now on.

Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>