boards/cpu: add support form EFM32 and starter kits#4722

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basilfx wants to merge 2 commits intoRIOT-OS:masterfrom basilfx:feature/efm32

+871,686

Commits on Jan 31, 2016

cpu/efm32: add support for efm32 and ezr32 mcus.
basilfx
committed
boards/efm32: add support for slstk3401a, stk3200, stk3600, stk3700 and stk3800
basilfx
committed