[TASK] Enable hardware divider in Nios II MN subsystem

This improves the MN's processing performance.

Change-Id: I0b9bc328b5def0cfd40314ce4f0174ed11089feb
[FIX] Add missing includes

Add missing includes to resolve compiler warnings.

Change-Id: Ifde29cffad948e08a9325a959e2d092dbb7ca254