The pci address of ehci host controller, in which usb debug feature is enabled.
The format of pci address is :

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| Bits 28..31 | Bits 20..27 | Bits 15..19 | Bits 12..14 | Bits 00..11 |

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| 0 | Bus | Device | Function | 0 |

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For the value 0x000EF000, it means the pci address at bus 0x0, device 0x1D, function 0x7.
Configure ehci host controller pci address.
0x80000001 | (gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdUsbEhciPciAddress & 0xF0000FFF) == 0

PCD Information

Name	Token Space	Token number	Data Type	Default Value
PcdUsbEhciPciAddress	gEfiSourceLevelDebugPkgTokenSpaceGuid	0x00000003	UINT32	0x000EF000