NVidia bionic merge; enable QCOM pow on A15

Includes ARM-specific floor, sqrt/sqrtf, sin/cos, and exp

Thank you to Shu Zhang and Johnny Qiu

xboxfanj note: This is modified for the KitKat bionic.  Based on
Nvidia's patches on the AOSP master gerrit.  I used most of their patches
here except for pow, which performs better with Qualcomm's routines.