multi-arfcn, trx: create transceivers based on command line arg

Move from the hard coded case of 3 transceiver instances to a
command line determined value. 'M' potential channels will be
compiled into the build depending on preprocessor selections
in radioParams.h. The command line argument must be less M.

Channels are selected starting from 0, which is centered on the
RF tuning frequency. Subsequent channels are selected by shifting
outward from 0 (center) in a left before right pattern. Default
channel spacing is 400 kHz. The ordering for supported cases of
1, 5, and 10 path channelizers is as follows.

CHAN_M = 1

    { 0 }

CHAN_M = 5

    { 0, 1, 4, 2, 3 }

CHAN_M = 10

    { 0, 1, 9, 2, 8, 3, 7, 4, 6, 5}

Note: Channel 5 for the 10 channel case sits on the Nyquist
frequency and is therefor unusable.

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

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