CRIS v32: dev88: add GPIO, LEDs, RTC, temp sensor

Add the GPIO driver to the device tree and, using it, support for the
LEDs and the RTC chip (via I2C-GPIO), as well as the temperature sensor
(via SPI-GPIO).

Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Jesper Nilsson <jespern@axis.com>