Transceiver52M: Set variable thread priority levels

The transceiver and underlying device drivers are threaded. use
the following priority levels.

0.50 - UHD driver internal threads
0.45 - Receive device drive thread
0.44 - Transmit device drive thread
0.43 - UHD asynchronous update thread (error reporting)
0.42 - Receive burst processing thread(s)

Signed-off-by: Thomas Tsou <tom@tsou.cc>
6 files changed