multi-arfcn, trx: attach FIFO's internally in transceiver

The original split-transceiver abstraction did not maintain
internal instances of the radio interface or drive loop.
The FIFO's were attached through external calls. The control
loop, however, made such an approach overly difficult, so
the transceiver now maintains pointers to the aforementioned
objects. In doing so, we no longer need external attachment
calls to setup the FIFO's.

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