usbdebug: Use CAR migration

If we already initialized EHCI controller and USB device in romstage,
locate active configuration from salvaged CAR_GLOBAL and avoid doing
the hardware initialisation again.

Change-Id: I7cb3a359488b25abc9de49c96c0197f6563a4a2c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3476
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
3 files changed