handover,sysmobts: Handle handover in the sysmobts code

When the lchan was activated for handover configure it to wait
for a RACH burst. On release make sure to always release the
RACH SAPI (in case it has been allocated). On the first frame
inform handover.c about it and forward the received access burst
to the handover layer.

Using an E71 it was possible to make a handover for SDCCH and
TCH/F from a nanoBTS but also from itself to itself. The vty
commands of OpenBSC and the silent-call have been used for that.
I didn't verify audio handling so far.

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