tree 51f7740c14e3b83305e1c35441ca0a69989388d8
parent ef2a0cd6351b9735ab448493eb75041ec0851ffa
author Mike Voydanoff <voydanoff@google.com> 1544980888 -0800
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1545063845 +0000

[usb] More prep work for soft transition of USB protocol

Copy system/dev/lib/usb to system/dev/lib/usb-old
and use usb-old for all the USB drivers in zircon.
After garnet switches to use usb-old, we can switch system/dev/lib/usb
to use banjo based USB protocol.

TEST: builds
Change-Id: I631ea8be4880576eaf2e574fbf380f7f1e2f0c07