pkg/nimble: configure BLE_LL_INIT_SLOT_SIZE to 1
pkg/nimble: configure BLE_LL_INIT_SLOT_SIZE to 1

OlegHahm/RIOT,OTAkeys/RIOT,miri64/RIOT,kYc0o/RIOT,ant9000/RIOT,jasonatran/RIOT,OTAkeys/RIOT,miri64/RIOT,kaspar030/RIOT,kYc0o/RIOT,OTAkeys/RIOT,jasonatran/RIOT,ant9000/RIOT,authmillenon/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,jasonatran/RIOT,kaspar030/RIOT,kaspar030/RIOT,ant9000/RIOT,OTAkeys/RIOT,ant9000/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,authmillenon/RIOT,miri64/RIOT,RIOT-OS/RIOT,miri64/RIOT,authmillenon/RIOT,OlegHahm/RIOT,kYc0o/RIOT,ant9000/RIOT,kaspar030/RIOT,kYc0o/RIOT,miri64/RIOT,authmillenon/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,RIOT-OS/RIOT