Add Fei incentives as native

[sendra]

Background: They used the wrong debt token which has the incentives controller as private. This means they cannot get the incentives controller from the token and therefore cannot display the correct apr.

Hardcode Fei incentives so it is as if it was native incentive, so it can show apr % and can be claimed directly from app.aave.com

This is needed because the FEI debtToken that is incentiviced is not from the latest version of tokens, so we can not get the incentive information automatically from the UiIncentivesProvider contract