altos/stmf0: use double buffering for USB rx data
authorKeith Packard <keithp@keithp.com>
Mon, 8 Jan 2018 01:43:42 +0000 (17:43 -0800)
committerKeith Packard <keithp@keithp.com>
Mon, 8 Jan 2018 01:43:42 +0000 (17:43 -0800)
This also allows us to stop shadowing USB rx buffers in system ram

Signed-off-by: Keith Packard <keithp@keithp.com>

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