SAMA5 OHCI+EHCI: Using cp15_clean instead of cp15_coherent; EHCI: Need to set alt pointer in order to handle short transfers.

Add a new method to the USB host driver interface:  getdevinfo.  This method will return information about the currently connected device.  At present, it only returns the device speed.  The speed is needed by the enumeration logic in order to set a credible initial EP0 max packet size

SAMA5 EHCI:  Taking direction from wrong bit in SETUP request; need to flush data buffer before starting SETUP request

Add ENCX24J600 Ethernet driver and support for the ENCX24J600 with the Olimex STM32 P107 board.  From Max Holtberg

SAMA5 OHCI:  Fix semaphore handling bug.  OHCI is now function by itself again after changes to integrate with EHCI

SAMA5: EHCI now handles low- and full-speed connections by giving them to OHCI; OHCI now uses the work queue to defer interrupt processing; If both OHCI and EHCI are enabled, EHCI is the master of the UHPHS interrupt

SAMA5/ECHI:  Debug register access, add logic to determine transfer size, fix setting of control bit in token