Host: Add phony "lo_locked" sensor to LMS db to make some UHD utils happy.
Host: Revert hacks in UHD calibrations utils related to lo_locked sensor. It is supported by UmTRX now.
Host: Add more verbose output to uhd_cal_rx_iq_balance.cpp
Host: Tweak constants in UHD calibration utils to work better with UmTRX.