The EFM32 Pearl Gecko Starter Kit contains sensors and
peripherals demonstrating the usage of the EFM32PG MCU
family. This patch adds basic support for this board
and is copied from EFM32WG-STK3800.
Signed-off-by: Gil Benkö <gil.benkoe@pm.me>
Signed-off-by: Christian Taedcke <hacking@taedcke.com>