Transceiver52M: Use exception blocks for rate changes
Transceiver52M: Use exception blocks for rate changes

UHD will throw if something goes awry in these sensitive sections,
so we should catch and shutdown gracefully. There is no recovery
if we can't set rates.

Signed-off-by: Thomas Tsou <tom@tsou.cc>

git-svn-id: 504cad4147f1e500be0a169b9f46375eaf875953@6724 19bc5d8c-e614-43d4-8b26-e1612bc8e597

kheimerl/vbts-openbts,ttsou/openbts-p2.8,ttsou/openbts-p2.8,kheimerl/vbts-openbts,kheimerl/vbts-openbts,ttsou/openbts-p2.8,kheimerl/vbts-openbts,ttsou/openbts-p2.8,kheimerl/vbts-openbts,ttsou/openbts-p2.8