Chip designer NXP Semiconductors (NXPI) has been riding an uptrend in the chip sector for two years. In 2013, chip designer stocks rose 16%, and then 20% last year. During the same period, NXP’s stock outperformed its group and the market — up 75% in 2013 and up 66% in 2014. Part of the strength in recent years is tied to NXP’s exiting areas where the company can’t be No. 1. Can the gains continue in 2015?