Are there any capacitive sense libraries for EFM32 devices?
Yes. The capacitive sense CSLIB library for EFM32 can be found in Simplicity Studio (www.silabs.com/simplicity).
For Gecko SDK v5.1.2, it's available here:
This library applies for EFM32 devices with or without LESENSE peripheral. More information can be found in AN0828 and AN0829 in Simplicity Studio or on www.silabs.com/32bit-appnotes.