MdeModulePkg/EhciDxe: enable 64-bit PCI DMA

PCI controller drivers must set the EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE
attribute if the controller supports 64-bit DMA addressing.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Feng Tian <feng.tian@Intel.com>

MdeModulePkg/Bus/Pci/EhciDxe/Ehci.h

@@ -173,6 +173,8 @@ struct _USB2_HC_DEV {
   UINT16                    DebugPortOffset; // The offset of debug port mmio register
   UINT8                     DebugPortBarNum; // The bar number of debug port mmio register
   UINT8                     DebugPortNum;    // The port number of usb debug port
+
+  BOOLEAN                   Support64BitDma; // Whether 64 bit DMA may be used with this device
 };