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

[benpicco]

@benpicco commented on this pull request.



> +    .wait_chip_erase = 240 * US_PER_SEC,
+    .wait_32k_erase = 700 * US_PER_MS,
+    .wait_sector_erase = 250 * US_PER_MS,
+    .wait_chip_wake_up = 1 * US_PER_MS,

Got them from the [data sheet](https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/n25q/n25q_256mb_3v.pdf)

![image](https://user-images.githubusercontent.com/1301112/100132335-93cac680-2e85-11eb-90e3-5360a047c7b8.png)


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