add module “RDA5807M”

[itschina]

Missing feature

See issue #1010 and note that we reserve the right to close feature requests if the originating poster is not proposing to resource the development him or herself.

Justification

Tell us why you would like to see this feature added.
I would like to use the module named RDA5807M，would you please add a lua lib for this module？Thanks very much！

Workarounds

Are there any workarounds you currently have in place because the feature is missing?
No