The lmp90100_evb sample included an implementation of double sqrt, and the
on_off_level_lighting_vnd_app sample included an implementation of float
sqrtf. Move that code into minimal libc instead of requiring applications
to hand-roll their own version.
Signed-off-by: Keith Packard <keithp@keithp.com>
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>