Kit joystick control example.

This example project use EFM32 CMSIS and the emlib peripheral library to
demonstrate the joystick control API of the development kit. Please note that
you need to configure the AEM-state to "EFM" to be able to operate this
example. The example also shows how to enable and use a GPIO interrupt.

Board:  Silicon Labs EFM32WG-DK3850 Development Kit
Device: EFM32WG990F256

