quanton: add adc support on receiver port
quanton makefile: added pios_adc.c
quanton: refactored adc support
battery: increase stack size to 448 bytes
Old size was 350 bytes. New size gives us 64 bytes remaining stack
f4 internal_adc driver: added .available and .number_of_channels
f4 internal_adc driver: removed unused global
Merge pull request #501 from lilvinz/quanton_adc

quanton: add adc support on receiver port