ledDriver: Unpack pairs of pixels at a time

Unpack two pixels at once, instead of just one.
board: phage2014: Enable ADC pin on board
phage2014: shell: Add ADC command

The ADC command simply returns the current ADC sample.
phage-adc: Use PIO for ADC, not DMA

DMA messes with the framebuffer driver.
Fix merge conflict
Fixup ADC interface, add Vu meter effect. Fix radio startup issue.