Library files for AD717x and AD411x family of products.

Dependents:  

This pull request has been rejected by Analog Devices

ad717x/ad411x no-OS driver updates

Added '.c' compatible ad717x/ad411x no-OS library files (analog github no-os drivers version)

Added '.c' compatible ad717x/ad411x no-OS library files (analog github no-os drivers version)