Add configuration nodes for following devices:

* GPIO block, with 22 pins
* MPP block, with 8 pins
* Volatage ADC (VADC), with multiple inputs
* Thermal sensor device, which is using on chip VADC
  channel report PMIC die temperature.
* RTC device
Signed-off-by: Ivan T. Ivanov <ivan.ivanov@linaro.org>
Signed-off-by: Kumar Gala <galak@codeaurora.org>