API: BIOS app state clear

[RaiBnod]

We are not updating BIOS anymore.

If due to some reason the BIOS app state got stuck, might be due to:

• unstable internet
• device restart in the meantime of the upgrade process etc.

We won't have any other option to restart that rubix-service upgrade until we get access to the device. Coz on that STARTED state, we upgrade rubix-service does nothing.

So, create an API on rubix-service which will be able to clear that BIOS app state forcefully and can restart the rubix-service upgrade.

Note: it's bad to access another app's data, even though we need this.

Data location for production: /data/rubix-bios/data/app_state.txt

Also, include this feature of cleaning on rubix-service start; similar to the existing one for rubix-service state clear.