msm8660: Add neon based pow() function for Scorpion

Add #define to enable neon based pow() function for msm8660.

(cherry picked from commit f795151ff5dc4eb622b2630cb6f42353db4a1b55)

Change-Id: Iab0f30eb0583c30bcfd6940a23f47e98ffe075df
2 files changed