When the sof module code was build, it was found that PI was not defined in the minimal library. Here are some mathematical constant definitions to avoid build errors. Signed-off-by: Yang XiaoHua <yangxiaohuamail@gmail.com>
Introduce math.h to get definitions of float_t and double_t. Signed-off-by: Kumar Gala <kumar.gala@linaro.org>