Merge branch 'mergeme/cbx'
Conflicts: host/docs/calibration.rst host/lib/usrp/dboard/db_sbx_common.cpp
Merge branch 'maint34' into maint
Merge branch 'xcvr2450_r21' into maint34
wbx: expand freq range low for r4
Fix syntax in XCVR driver.
xcvr2450: created xcvr2450 r21 that uses external divider
wbx: updating the code to allow full range of the VCO.
wbx v4: fixing the drivers for the new rev of the WBX board
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