rtlsdr-tetra: remove unneeded import
rtlsdr-tetra: remove unneeded import

Signed-off-by: Steve Markgraf <9ce5770b3bb4b2a1d59be2d97e34379cd192299f@steve-m.de>
sq5bpf/osmo-tetra-sq5bpf,dachomk/osmo-tetra-sq5bpf,luckyhacky/osmo-tetra-test,geosphere/osmo-tetra,osmocom/osmo-tetra,marcelmaatkamp/docker-gnuradio-osmocom-tetra,bastibl/osmo-tetra,kantooon/osmo-tetra,kantooon/osmo-tetra,osmocom/osmo-tetra,luckyhacky/osmo-tetra-test,bastibl/osmo-tetra,dachomk/osmo-tetra-sq5bpf,marcelmaatkamp/docker-gnuradio-osmocom-tetra,sq5bpf/osmo-tetra-sq5bpf,dachomk/osmo-tetra-sq5bpf,luckyhacky/osmo-tetra-test,osmocom/osmo-tetra,geosphere/osmo-tetra,geosphere/osmo-tetra,marcelmaatkamp/docker-gnuradio-osmocom-tetra,marcelmaatkamp/docker-gnuradio-osmocom-tetra,Tim---/osmo-tetra,Tim---/osmo-tetra,bastibl/osmo-tetra,sq5bpf/osmo-tetra-sq5bpf,Tim---/osmo-tetra,bastibl/osmo-tetra,dachomk/osmo-tetra-sq5bpf,sq5bpf/osmo-tetra-sq5bpf,kantooon/osmo-tetra