fix returned Rx frequency value when TDD is enabled
fix returned Rx frequency value when TDD is enabled

limemicro/lms7suite,limemicro/lms7suite,myriadrf/LimeSuite,myriadrf/LimeSuite,myriadrf/LimeSuite,limemicro/lms7suite,limemicro/lms7suite,limemicro/lms7suite,myriadrf/LimeSuite,myriadrf/LimeSuite