SAMA5 OHCI:  Fix some problems with D-Cache coherency and physical addressing related to interrupt endpoints

SAMA5 OHCI:  When UPLL drives OHCI the logically correct divider of 10 does not work;  But a divider of 5 does.  Why?

SAMA5 EHCI:  Fix bits being clobbered in PORTSC on hand-off to OHCI.  OHCI: Fix some more trace configuration issues.  Both:  Don't muck with SFR port selection bits once they have been initialized

SAMA5 EMAC:  Resolve issues with DUAL PHY support needed for both EMAC and GMAC peripherals.  EMAC driver is now code complete and builds without complaint

SAMA5 EHCI:  Did not work with DEBUG off.  Appears to be because of some D-Cache flushing that was performed only with DEBUG ON.  Now is unconditional

USB MSC host class driver: Don't bother retrying to initialize the FLASH if the interface is returning fatal transfer errors