SConstruct: include ks0108b files in compilation
include comma at the end of list
adc.c: (car (cdr (cdr))) instead of an explicit cadr

I'm unable (at the moment, I'm on the bus) to figure
out why doing a cadr fails and results in a hard fault
on the stm32f103re. Doing two cdr invocations seems
to be working fine.

Let's get back to this later. I could be overlooking
something.
ks0108b.c: move platform_conf include outside #ifdef check
stm32/platform_conf.h: include reference to ks0108b
stm32/platform_conf.h: include reference to adc module
mizar32_conf.h: include reference to adc module
CHANGELOG: update file with an entry for ks0108 module