Staging:dgnc: Use uaccess.h header from linux dir instead of asm

Include <linux/uaccess.h> instead of <asm/uaccess.h>

Signed-off-by: Iulia Manda <iulia.manda21@gmail.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>