[riot-notifications] [RIOT-OS/RIOT] stm32/spi : Add check for GPIO_UNDEF (#16625)

Akshai M (Augustus Diode) notifications at github.com
Thu Jul 8 15:33:46 CEST 2021

> What is `GPIO_AF_UNDEF` supposed to be?

@fjmolinas  mentioned it [here](https://github.com/RIOT-OS/RIOT/pull/16579#discussion_r665977761) . Adding `GPIO_AF_UNDEF` as a symbol to `gpio_af_t`

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