Bas Stottelaar 1105f60a23 cpu/efm32: make series defines explicit
The EFM32 uses the provided _SILICON_LABS_32B_SERIES_0 and
_SILICON_LABS_32B_SERIES_1 definitions to enable or disable certain
code. With the introduction of new MCUs, there is also the
_SILICON_LABS_32B_SERIES_2 definition.

This PR ensures that the defines are explicit, and that #else
statements don't target the wrong series.
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