ramips: Xiaomi MiWiFi Nano: fix status led

- add status led for Xiaomi MiWiFi Nano
- revert https://github.com/lede-project/source/commit/af1e70b4a730e91ce1668d506ebc5c1c8cf5abf5

 , this should not be added.

Signed-off-by: Cezary Jackiewicz <cezary@eko.one.pl>