USB: make hcd.h public (drivers dependency)

The usbcore headers: hcd.h and hub.h are shared between usbcore,
HCDs and a couple of other drivers (e.g. USBIP modules).
So, it makes sense to move them into a more public location and
to cleanup dependency of those modules on kernel internal headers.
This patch moves hcd.h from drivers/usb/core into include/linux/usb/

Signed-of-by: Eric Lescouet <eric@lescouet.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/fhci-dbg.c b/drivers/usb/host/fhci-dbg.c
index e799f86..6fe5500 100644
--- a/drivers/usb/host/fhci-dbg.c
+++ b/drivers/usb/host/fhci-dbg.c
@@ -20,7 +20,7 @@
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/usb.h>
-#include "../core/hcd.h"
+#include <linux/usb/hcd.h>
 #include "fhci.h"
 
 void fhci_dbg_isr(struct fhci_hcd *fhci, int usb_er)