driver core: bus: constify some internal functions

The functions add_probe_files() and remove_probe_files() should be
taking a const * to bus_type, not just a *, so fix that up.  These
functions should really be removed entirely and an attribute group used
instead, but for now, make this change so that other const work can
continue.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230208111330.439504-21-gregkh@linuxfoundation.org


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