Overclocking this is only going to prove to be difficult if not fruitless. The max clock is locked unless this laptop has a separate clock controller that allows for the base clock to be raised. You can try to raise the multiplier but here is the thing that the APU often responds by lowering the base clock to keep with the original core clocks. So for the Bobcat platform overclocking by the base clock is the only way to see any overclocking gains.
BTW cpu-z has a habit of miss reporting the actual clocks so use a different utility just in case to confirm the clocks when overclocking but at stock no issues.