[riot-notifications] [RIOT-OS/RIOT] cpu/samd5x: CPU init fixes (#11655)

benpicco notifications at github.com
Mon Jun 17 18:10:03 CEST 2019

Ok I think now it should be right.

That is, `make -C tests/riotboot riotboot/flash-combined-slot0` now works on both same54-xpro and our custom samd51 board, or `cpu_init()` survives being called twice.

Another gotcha is that DPLL must run with at least 96 MHz, so setting a lower CPU frequency invokes undefined behavior unless a divider is applied.
But this is for another PR. 

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