usbdebug: Dump low-level protocol details

Dumping these EHCI host controller registers is useful to
solve problems with debug devices.

Change-Id: I0610cecca57b1b952d4f87211dd00c8c0bc398b9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3866
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
1 file changed