usb: 64-bit architectures support for xHCI
This commit allows xHCI to use both 64 and 32 bit memory physical addresses depending on architecture it's being built for. Also it makes use of readq()/writeq() on 64-bit systems Signed-off-by: NSergey Temerkhanov <s.temerkhanov@gmail.com> Signed-off-by: NRadha Mohan Chintakuntla <rchintakuntla@cavium.com>
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