[riot-notifications] [RIOT-OS/RIOT] cpu/sam0_common: SPI: add support for QSPI in SPI mode (#15361)

[benpicco]

> btw I slow down the SCK speed to 10MHz and the test still takes 4 minutes to succeed. Is there something wrong with the clock ?

It's all in line with the data sheet

![100132335-93cac680-2e85-11eb-90e3-5360a047c7b8](https://user-images.githubusercontent.com/1301112/100281192-bc2bf100-2f69-11eb-8f95-0d57ea426819.png)

240s = 4 min

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