[riot-notifications] [RIOT-OS/RIOT] boards: move programmer includes in Makefile.include (#15475)

[Francisco]

Some commands are now yielding the following error:

```
BOARD=slstk3402a make -C tests/bloom_bytes/ info-modules --no-print-directory
/home/francisco/workspace/RIOT/tests/bloom_bytes/../../Makefile.include:548: *** FLASHFILE is not defined for this board: .  Stop.
```

```
 *** FLASHFILE is not defined for this board: .  Stop.
```

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