staging: kpc2000: remove unnecessary include in core.c

Fixes checkpatch.pl warning "Use #include <linux/io.h> instead of
<asm/io.h>".
Signed-off-by: Simon Sandström <simon@nikanor.nu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/kpc2000/kpc2000/core.c

@@ -12,7 +12,6 @@
 #include <linux/cdev.h>
 #include <linux/rwsem.h>
 #include <linux/uaccess.h>
-#include <asm/io.h>
 #include <linux/io.h>
 #include <linux/mfd/core.h>
 #include <linux/platform_device.h>