[entropy] Raise USB baud rate to match application 'cc20rng'

Using different baud rates for the two otherwise compatible
applications risk confusing users of both applications. An espeicially
unlucky case is setting host side to 460800 while reading from a
board set to 921600 -- the stream will look random while it's actually
pretty bad.

Raising 'entropy' rather than lowering 'cc20rng' is motivated by the
fact that cc20rng saturates 460800 baud(*) with its ~75 kB/s output.

(*) 460800 baud should be 57.6 kB/s or 51.2 kB/s, depending on whether
or not the stop bit is counted towards the baud rate. I would suppose
it is.

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