Peripheral control example.

This example project use EFM32 CMSIS and the emlib peripheral library
to demonstrate how to enable the access to various on-board peripherals.
To reduce leakage current, the EFM32G-DK3550 board has several analog
switches, and to enable extended functionality there are multiplexers
which need to be configured correctly for most of the kit peripherals.

The on-board LEDs will light up according to the configured state of the
peripherals.

Board:  Silicon Labs EFM32G-DK3550 Development Kit
Device: EFM32G890F128

