Debug Plugin: Use the AXI Core ADC and DAC register maps
BLOCK DIAGRAMS: update block diagram, as some folks were complaining that
                the simplified block diagram was, well - too simple.
                Biggest change was to ensure the quadrature demodulators
                / modulators have more than one mixer.

Signed-off-by: Robin Getz <Robin.Getz@analog.com>
Block Diagrams: Update FMCOMMS2, based on discussion with Michael, over
dinner.

Signed-off-by: Robin Getz <Robin.Getz@analog.com>