GUID used to "Tcg2PhysicalPresence" variable and "Tcg2PhysicalPresenceFlags" variable for TPM2 request and response.
Include/Guid/Tcg2PhysicalPresenceData.h

GUID Information

GUID's Guid Name	GUID's Guid
gEfiTcg2PhysicalPresenceGuid	{ 0xaeb9c5c1, 0x94f1, 0x4d02, { 0xbf, 0xd9, 0x46, 0x2, 0xdb, 0x2d, 0x3c, 0x54 }}

Refer to Header File