transceiver, usrp1: fix transmit gain setting bug
transceiver, usrp1: fix transmit gain setting bug

Transmit gain setting would deceptively set the receive
gain instead. Since transmit attenuation is a combination
of RF gain and digital scaling, this major copy/paste bug
may have gone unnoticed by many users.

Reported-by: Robin Coxe <coxe@close-haul.com>
Signed-off-by: Thomas Tsou <ttsou@vt.edu>

git-svn-id: 504cad4147f1e500be0a169b9f46375eaf875953@3309 19bc5d8c-e614-43d4-8b26-e1612bc8e597

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