OFFSET FOR CC1101 EXTERNAL

### Description of the feature you're suggesting. Hello ! so lot of people ended up buying fake cc1101 that have wrong frequency TX like they transmit on 433.92mhz and it TX on 433.87mhz adding offset option for external cc1101 would be really great even some real cc1101 have some little difficulties and would help a lot of people ! Thank you for your response ### Anything else? _No response_