BoardConfig: Use Qualcomm optimizations for Bionic libs

By enabling TARGET_USE_KRAIT_BIONIC_OPTIMIZATION, there are
noticeable improvements in terms of performance.
This option allows to use optimized assembly routines for
some math operations (sin, cosin, e_power, e_sqrt, e_sqrtf)
for bionic libm library.

Change-Id: I6c897ba2362106f63a2121b54597e6fac470592f