Move implementation of rsFrac from cpu_ref into driver/runtime.

Move the implementation of all the rsFrac functions from
rsCpuRuntimeMath.cpp to driver/runtime/rs_core.c.

Change-Id: I42bb4ba694fff76854c8deaefdd55671fec40acc
Signed-off-by: Verena Beckham <verena@codeplay.com>
2 files changed