[riot-notifications] [RIOT-OS/RIOT] Kconfig: add modules and configurations to run tests/periph_* (#14777)

[Francisco]

Hmm, I'm not getting the same binaries on `tests/periph_backup_ram`:


- `TEST_KCONFIG=0`
```
   text	   data	    bss	    dec	    hex	filename
  12404	    120	   2380	  14904	   3a38	/home/francisco/workspace/RIOT2/tests/periph_backup_ram/bin/same54-xpro/tests_periph_backup_ram.elf
```


- `TEST_KCONFIG=1`
```
   text	   data	    bss	    dec	    hex	filename
  12292	    120	   2380	  14792	   39c8	/home/francisco/workspace/RIOT2/tests/periph_backup_ram/bin/same54-xpro/tests_periph_backup_ram.elf
```

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