staging: unisys: visorbus: bus_create no longer calls bus_epilog

Have bus_create call chipset_bus_create directly instead of going
through the function bus_epilog.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <Timothy.Sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>