math: p_sincos: Add function implementation
math: p_sincos: Add function implementation

Naive implementation using already defined API functions.
Removed math.h include since used funcs reside in pal_math.h
included with pal.h
Resolves #32.

Signed-off-by: Mateusz Kacprzak <bc894a8e1b1a34aed79275f42996b76d0cbc3c43@yandex.ru>

debug-de-su-ka/pal,Adamszk/pal3,parallella/pal,debug-de-su-ka/pal,aolofsson/pal,RafaelRMA/pal,parallella/pal,mateunho/pal,mateunho/pal,8l/pal,8l/pal,eliteraspberries/pal,debug-de-su-ka/pal,mateunho/pal,twocs/pal,eliteraspberries/pal,RafaelRMA/pal,aolofsson/pal,Adamszk/pal3,parallella/pal,olajep/pal,twocs/pal,eliteraspberries/pal,Adamszk/pal3,RafaelRMA/pal,twocs/pal,mateunho/pal,eliteraspberries/pal,Adamszk/pal3,8l/pal,parallella/pal,olajep/pal,aolofsson/pal,aolofsson/pal,debug-de-su-ka/pal,twocs/pal,RafaelRMA/pal,olajep/pal,8l/pal,olajep/pal,eliteraspberries/pal,debug-de-su-ka/pal,parallella/pal,mateunho/pal