* ADC: fixes:
-use enums
-internalAdcIndexByHardwareIndex array should be adc_channel_e size
-add sanity checks
-save few bytes of RAM
* ADC: use logical OR instead of math add
* ADC: move DMA buffer outside of AdcDevice (save few bytes)
* ADC: inlcude fast channels to debug output
* ADC: save some CPU ticks (disabled until fully tested)
* ADC: simplify