usrp1: fix transmit side tuning bug
usrp1: fix transmit side tuning bug

Transmit tuning was primarily setup for side A only. Some boards
- WBX - would still tune with improper channel arguments, though
receiver performance was disrupted.

Previous testing was primarily with single board on side A only
or dual configuration with side A transmit, so this bug largely
went undetected. Patch tested with RFX and WBX daughterboards
in single and dual configurations sides A and B.

Signed-off-by: Thomas Tsou <ttsou@vt.edu>

git-svn-id: 504cad4147f1e500be0a169b9f46375eaf875953@2658 19bc5d8c-e614-43d4-8b26-e1612bc8e597

WindyCitySDR/openbts,hongyunnchen/openbts,hongyunnchen/openbts,Djimmer/obts,endaga/openbts,maxifree/openbts,xyzr0482/openbts,Djimmer/obts,WindyCitySDR/openbts,hongyunnchen/openbts,brunoflce/pessoalopenBTS,dhenyjarasandy/openbts,maxifree/openbts,endaga/openbts,maxifree/openbts,Djimmer/obts,Djimmer/obts,Djimmer/obts,endaga/openbts,RangeNetworks/openbts,RangeNetworks/openbts,xyzr0482/openbts,dhenyjarasandy/openbts,xyzr0482/openbts,WindyCitySDR/openbts,RangeNetworks/openbts,RangeNetworks/openbts,hongyunnchen/openbts,dhenyjarasandy/openbts,brunoflce/pessoalopenBTS,RangeNetworks/openbts,dhenyjarasandy/openbts,maxifree/openbts,maxifree/openbts,brunoflce/pessoalopenBTS,WindyCitySDR/openbts,brunoflce/pessoalopenBTS,Djimmer/obts,xyzr0482/openbts,brunoflce/pessoalopenBTS,endaga/openbts,hongyunnchen/openbts,endaga/openbts,WindyCitySDR/openbts,RangeNetworks/openbts,xyzr0482/openbts,dhenyjarasandy/openbts