remove usbdebug.h include from mainboard/romstage code

remove usbdebug.h include from mainboard/romstage code

No romstage is supposed to use usbdebug functions/defines
directly, so remove all those includes. The usb code is now
called and setup from console code.

Change-Id: I9b1120d96f5993303d6b302accc86e14a91f7a9f
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-on: http://review.coreboot.org/354
Tested-by: build bot (Jenkins)