This implementation prints out the default device announcement message.
Given device foo0 on bus bar0 where foo0 has the name "FooCard 1234" the
following would be printed:
foo0: <FooCard 1234> on bar0
bus_generic_print_child itself calls two functions
The former prints "foo0: <FooCard 1234>" and the latter "on bar0".
These routines should be used if possible in your own code if
does not completely suit your needs.