GUID used to "PhysicalPresence" variable and "PhysicalPresenceFlags" variable for TPM request and response.
Include/Guid/PhysicalPresenceData.h

GUID Information

GUID's Guid Name	GUID's Guid
gEfiPhysicalPresenceGuid	{ 0xf6499b1, 0xe9ad, 0x493d, { 0xb9, 0xc2, 0x2f, 0x90, 0x81, 0x5c, 0x6c, 0xbc }}

Refer to Header File