LM73: fix temperature sensor on SANTARO/SANTOKA
For SANTARO/SANTOKA the board temperature sensor was declared as "national,lm75" in the device-tree resulting in the LM73 sensor equipped on these system being treated as LM75 and therefore giving wrong temperature read-outs.
This patch declares the temperature correctly as "national,lm73", which results in proper temperature read-outs.
YT-348