cpu/kinetis+boards: fixed UART configuration #6958
Merged
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In #6868 I overlooked a sub-optimal UART configuration. This PR enables to arbitrarily order the (logical) UART devices for Kinetis CPUs (as done for other platforms), so no need to configure unused UART devices anymore -> saves ROM on e.g. phyNODE
tested on
mulle
andphyNODE