Internal temperature sensor example.

This example project uses the EFM32 CMSIS and emlib to demonstrate
the usage of the internal temperature sensor on rev.C EFM32 Gecko
devices.

Note: EFM32 devices with production ID lower than 18 may measure inaccurate
temperatures due to a sensor calibration bug.

Board:  Silicon Labs EFM32-G8xx-STK Starter Kit
Device: EFM32G890F128

