drivers: base: remove unused function find_bus()

find_bus() isn't doing anyone any good sitting in a '#if 0' (as it's
been doing since 2006!).

Signed-off-by: Joe Pater <02joepater06@gmail.com>
Link: https://lore.kernel.org/r/20210103203238.111565-1-02joepater06@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>