[PATCH] Ingenic: iio/adc: add JZ4760(B) support to the

[citral23 <cbranchereau@xxxxxxxxx>]

This is a set of patches to add support for the JZ4760(B) socs
to ingenic-sadc, those socs have 3 aux channels, and the JZ4760B
has an extra register to set the battery divider as internal or 
external.