usbdebug: Move under drivers/usb

Also relocate and split header files, there is some interest
for EHCI debug support without PCI.

Change-Id: Ibe91730eb72dfe0634fb38bdd184043495e2fb08
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5129
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
diff --git a/src/southbridge/intel/lynxpoint/usb_ehci.c b/src/southbridge/intel/lynxpoint/usb_ehci.c
index 4382611..845129f 100644
--- a/src/southbridge/intel/lynxpoint/usb_ehci.c
+++ b/src/southbridge/intel/lynxpoint/usb_ehci.c
@@ -23,7 +23,7 @@
 #include <device/device.h>
 #include <device/pci.h>
 #include <device/pci_ids.h>
-#include <usbdebug.h>
+#include <device/pci_ehci.h>
 #include <arch/io.h>
 #include "pch.h"