Gregory Nutt c1f75af084 Fix SAMA5D* warnings
sama5d3-xplained:ethernet-over-phy configuration found in build testing:

  arch/arm/src/sama5/sam_irq.c:  Fix "Control reaches end of non-void function " warning
  arch/arm/src/sama5/sam_udphs.c:  Fix "unused variable 'epno'" warning
  boards/arm/sama5/sama5d*-*/src/sam_usb.c:  Fix "warning 'HAVE_USBHOST' not defined" warnings
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