There are EHCI compatible host controllers on ARM without PCI bus architecture. Currently we have not come across one with the debug capability though. Change-Id: I8775c9814f6fdf8754f97265118a7186369d721d Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: http://review.coreboot.org/5175 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@google.com>