Revert "libm: replace Qualcomm's arm routines  with Nvidia's (except pow)"

This broke A9.  Revert temporarily.

This reverts commit a11ffe472855d15e8dad4f2d266c3ce72dc10b50.

Change-Id: I627e553580773595d7d147a3a57363544c097269
Merge "Revert "libm: replace Qualcomm's arm routines  with Nvidia's (except pow)"" into kk4.4