staging: i2o: Use #include <linux/uaccess.h> instead of <asm/uaccess.h>

This patch fixes the following checkpatch.pl warning:
Use #include <linux/uaccess.h> instead of <asm/uaccess.h>

Signed-off-by: Aya Mahfouz <mahfouz.saif.elyazal@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>