staging: unisys: visorbus: Convert visorchipset.h refs

visorbus_private.h was previously named visorchipset.h. This patch removes
references to the old filename, and updates them with the new filename.

Signed-off-by: David Binder <david.binder@unisys.com>
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>