uhd: Pass UHD command line arguments to constructor
uhd: Pass UHD command line arguments to constructor

Previous behaviour used UHD command line args string for device search,
but did not apply the values to the device constructor. Now use the user
passed args string for both find and device construction.

Signed-off-by: Tom Tsou <072b11b861b7a066437a0a0cead1208995732a66@ettus.com>

ttsou/osmo-trx,osmocom/osmo-trx,ttsou/osmo-trx,osmocom/osmo-trx,osmocom/osmo-trx,ttsou/osmo-trx,kkroo/osmo-trx,osmocom/osmo-trx,kkroo/osmo-trx,kkroo/osmo-trx,ttsou/osmo-trx,kkroo/osmo-trx