[riot-notifications] [RIOT-OS/RIOT] Feat/add flashwrite APIs (#15511)

[benpicco]

@benpicco commented on this pull request.



> @@ -150,6 +151,34 @@ int riotboot_flashwrite_putbytes(riotboot_flashwrite_t *state,
     return 0;
 }
 
+int riotboot_flashwrite_invalidate(int slot)
+{
+    extern const unsigned riotboot_slot_numof;
+
+    if (riotboot_slot_numof == 1){
+        LOG_WARNING(LOG_PREFIX "Only one slot configured\n");
+        return -1;
+    }
+    if ((riotboot_slot_validate(riotboot_slot_other()) != 0) || (riotboot_slot_validate(riotboot_slot_current()) != 0)){
+        LOG_INFO(LOG_PREFIX "There will be no valid images to run after reboot\n");
+        return -2;
+    }
+
+    uint8_t data_flash[4] = { INVALIDATE_HDR };

This will only set the first element to `INVALIDATE_HDR` and the others to `0`.
Granted, the signature will be invalidated if even a single character is changed, but what you were trying to achieve can be done with 

```suggestion
    uint8_t data_flash[RIOTBOOT_MAGIC];
    memset(data_flash, INVALIDATE_HDR, sizeof(RIOTBOOT_MAGIC));
```

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