MdePkg/Pldm.h: Add define for the PLDM response flag #506

Job	Run time
Analyze (ArmPkg, IA32,X64)	11m 51s
Analyze (CryptoPkg, IA32)	29m 25s
Analyze (CryptoPkg, X64)	30m 13s
Analyze (DynamicTablesPkg, IA32,X64)	11m 41s
Analyze (FatPkg, IA32,X64)	16m 34s
Analyze (FmpDevicePkg, IA32,X64)	20m 47s
Analyze (IntelFsp2Pkg, IA32,X64)	21m 13s
Analyze (IntelFsp2WrapperPkg, IA32,X64)	22m 46s
Analyze (MdeModulePkg, IA32)	33m 33s
Analyze (MdeModulePkg, X64)	31m 14s
Analyze (MdePkg, IA32,X64)	26m 51s
Analyze (PcAtChipsetPkg, IA32,X64)	22m 25s
Analyze (PrmPkg, IA32,X64)	15m 22s
Analyze (SecurityPkg, IA32,X64)	24m 17s
Analyze (ShellPkg, IA32,X64)	24m 29s
Analyze (SourceLevelDebugPkg, IA32,X64)	15m 27s
Analyze (StandaloneMmPkg, IA32,X64)	14m 28s
Analyze (UefiCpuPkg, IA32,X64)	23m 39s
Analyze (UnitTestFrameworkPkg, IA32,X64)	21m 10s
	6h 57m 25s

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