[riot-notifications] [RIOT-OS/RIOT] cpu/sam0_common: flashpage: add functions to write to user config area / AUX page (#14512)

[Juergen Fitschen]

Quick test on `samr30-xpro`:

```
> dump_config_page
2020-11-03 22:47:54,501 #  dump_config_page
2020-11-03 22:47:54,507 # 00000000  FF  86  1E  B1  BB  F8  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF
2020-11-03 22:47:54,514 # 00000010  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF
2020-11-03 22:47:54,521 # 00000020  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF
2020-11-03 22:47:54,527 # 00000030  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF
> test_config_page
2020-11-03 22:50:01,180 #  test_config_page
2020-11-03 22:50:01,181 # [START]
2020-11-03 22:50:01,184 # [SUCCESS]
> dump_config_page
2020-11-03 22:50:12,548 #  dump_config_page
2020-11-03 22:50:12,555 # 00000000  FF  86  1E  B1  BB  F8  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF
2020-11-03 22:50:12,562 # 00000010  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF
2020-11-03 22:50:12,568 # 00000020  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF  FF
2020-11-03 22:50:12,575 # 00000030  FF  FF  FF  FF  FF  FF  FF  FF  FF  AA  BB  CC  DD  EE  34  12
```

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