ArmPkg/ProcessorSubClassDxe: Limit CoreCount to 0xFF #73

Job	Run time
Analyze (ArmPkg, IA32,X64)	5m 19s
Analyze (CryptoPkg, IA32)	21m 9s
Analyze (CryptoPkg, X64)	20m 52s
Analyze (DynamicTablesPkg, IA32,X64)	16m 20s
Analyze (FatPkg, IA32,X64)	13m 3s
Analyze (FmpDevicePkg, IA32,X64)	16m 34s
Analyze (IntelFsp2Pkg, IA32,X64)	16m 53s
Analyze (IntelFsp2WrapperPkg, IA32,X64)	18m 38s
Analyze (MdeModulePkg, IA32)	23m 34s
Analyze (MdeModulePkg, X64)	21m 22s
Analyze (MdePkg, IA32,X64)	18m 3s
Analyze (PcAtChipsetPkg, IA32,X64)	19m 45s
Analyze (PrmPkg, IA32,X64)	16m 33s
Analyze (SecurityPkg, IA32,X64)	17m 47s
Analyze (ShellPkg, IA32,X64)	19m 42s
Analyze (SourceLevelDebugPkg, IA32,X64)	17m 44s
Analyze (StandaloneMmPkg, IA32,X64)	12m 43s
Analyze (UefiCpuPkg, IA32,X64)	18m 2s
Analyze (UnitTestFrameworkPkg, IA32,X64)	14m 37s
	5h 28m 40s

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