uhd: flush initial receive samples
uhd: flush initial receive samples

Occasionally, the E100 will have errant timestamps at start
related to previous sessions. Early packets will be thrown
out anyways, so do this explicitly so the timestamps don't
royally fuck up the sample timing.

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

git-svn-id: 504cad4147f1e500be0a169b9f46375eaf875953@2635 19bc5d8c-e614-43d4-8b26-e1612bc8e597

0x7678/openbts-multi-arfcn,kheimerl/vbts-openbts,0x7678/openbts-multi-arfcn,0x7678/openbts-2.8,ttsou/openbts-p2.8,kheimerl/vbts-openbts,0x7678/openbts-multi-arfcn,fairwaves/openbts-2.8,0x7678/openbts-multi-arfcn,0x7678/openbts-multi-arfcn,ttsou/openbts-p2.8,fairwaves/openbts-2.8,0x7678/openbts-2.8,zabbal/openbts-p2.8,ttsou/openbts-p2.8,ttsou/openbts-p2.8,ttsou/openbts-p2.8,zabbal/openbts-p2.8,fairwaves/openbts-2.8,0x7678/openbts-2.8,0x7678/openbts-2.8,kheimerl/vbts-openbts,kheimerl/vbts-openbts,fairwaves/openbts-2.8,fairwaves/openbts-2.8,kheimerl/vbts-openbts,0x7678/openbts-2.8,zabbal/openbts-p2.8,zabbal/openbts-p2.8,zabbal/openbts-p2.8