usrp2: make the booty smaller than the number of recv frames

This may fix some of our woes when the host cannot keep up.
That is, with a smaller booty, the managed buffers will get
freed up and the call to get buffer will never block waiting
for a buffer to become free. This has several side effects:

1)
Overflows are more likely to occur in the pirate thread.
Pirate-based overflows will overwrite old packets, whereas
socket-based overflows will discard newer incoming packets.

2)
The pirate thread will continue to pull in async packets
rather than loosing them in a socket-based overflow.

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