staging: unisys: include: Remove unneeded includes from visorbus.h

A bunch of code churn has caused the following include files to not be
needed by visorbus.h:

linux/poll.h
linux/kernel.h
linux/uuid.h
linux/seq_file.h
Reviewed-by: Sameer Wadgaonkar <sameer.wadgaonkar@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>

drivers/staging/unisys/include/visorbus.h

@@ -31,10 +31,6 @@
 
 #include <linux/device.h>
 #include <linux/module.h>
-#include <linux/poll.h>
-#include <linux/kernel.h>
-#include <linux/uuid.h>
-#include <linux/seq_file.h>
 #include <linux/slab.h>
 
 #include "channel.h"