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.
2020-07-08 21:54:57 +02:00
..