boards: cpu: replace GPIO_UNDEF by SPI_CS_UNDEF in SPI configuration #17468
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Contribution description
STM32, Kinetis and cc2538 based boards are updated.
This PR make the SPI implementations and configurations of kinetis, stm32 and cc2538 cpu/boards valid API wise.
It's a takeover of #6486
Testing procedure
A green CI should be enough
Issues/PRs references
Takeover of #6486, so closes #6486