[riot-notifications] [RIOT-OS/RIOT] boards/firefly: add renode configuration (#15489)

[Francisco]

`examples/default` seems to work correctly:
```
main(): This is RIOT! (Version: 2021.01-devel-1084-gcfb77-pr-15489)
Welcome to RIOT!
> help
Command              Description
---------------------------------------
reboot               Reboot the node
version              Prints current RIOT_VERSION
pm                   interact with layered PM subsystem
ps                   Prints information about running threads.
saul                 interact with sensors and actuators using SAUL
> ps
 pid | name                 | state    Q | pri | stack  ( used) ( free) | base addr
  | current     
   - | isr_stack            | -        - |   - |    512 (  188) (  324) | 0x2000000
0 | 0x200001c8
   1 | main                 | running  Q |   7 |   1536 (  644) (  892) | 0x2000028
4 | 0x2000080c 
     | SUM                  |            |     |   2048 (  832) ( 1216)
> pm
Usage:
 pm show: display current blockers for each power mode
 pm set <mode>: manually set power mode (lasts until WFI returns)
 pm block <mode>: manually block power mode
 pm unblock <mode>: manually unblock power mode
 pm off: call pm_off()
> reboot
main(): This is RIOT! (Version: 2021.01-devel-1084-gcfb77-pr-15489)
Welcome to RIOT!
> help
Command              Description
---------------------------------------
reboot               Reboot the node
version              Prints current RIOT_VERSION
pm                   interact with layered PM subsystem
ps                   Prints information about running threads.
saul                 interact with sensors and actuators using SAUL
> version
2021.01-devel-1084-gcfb77-pr-15489
> 
```

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