grove: add temperature sensor

Add driver for the Grove Temperature Sensor which measures ambient
temperature.

Sensor reference page:
	http://www.seeedstudio.com/wiki/Grove_-_Temperature_Sensor



Change-Id: I4f56224be5fa7a968749d5d4df8cb99a462c3c21
Origin: original
Signed-off-by: Bogdan Davidoaia <bogdan.m.davidoaia@intel.com>