mfd: arizona: Update DT bindings to add CS47L24 and WM1831

This updates the Arizona MFD device tree bindings to add the
Cirrus Logic CS47L24 and WM1831 codecs. Note that unlike all the
other codecs the DCVDD-supply and MICVDD-supply are mandatory.

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>