meta-ettus-core: uhd: Remove leftover python dependencies
meta-ettus-core: uhd: Remove leftover python dependencies

Remove leftover python dependencies since UHD can and should
be built with python3 support instead these days.

Signed-off-by: Moritz Fischer <16c4312f096cb05ec900643fe7a5f22f7761ab4a@ettus.com>

EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus