Deprecated uhd::device API

[aroberts109]

Fails to make when using uhd >3.10 due to deprecation of uhd::device API e.g., uhd::device::SEND_MODE_FULL_BUFF. This API is deprecated as of uhd v3.4 but support is completely dropped in v3.11.

[jgaeddert]

Thanks for the tip. Unfortunately I don't have easy access to a device using the UHD at the moment so it's difficult for me to test. I could of course build it, but I don't have a good way to test it.