OvmfPkg: remove CSM_ENABLE build macro #1

Job	Run time
Analyze (ArmPkg, IA32,X64)	5m 39s
Analyze (CryptoPkg, IA32)	15m 44s
Analyze (CryptoPkg, X64)	16m 12s
Analyze (DynamicTablesPkg, IA32,X64)	5m 37s
Analyze (FatPkg, IA32,X64)	10m 7s
Analyze (FmpDevicePkg, IA32,X64)	12m 26s
Analyze (IntelFsp2Pkg, IA32,X64)	13m 27s
Analyze (IntelFsp2WrapperPkg, IA32,X64)	11m 57s
Analyze (MdeModulePkg, IA32)	15m 18s
Analyze (MdeModulePkg, X64)	18m 52s
Analyze (MdePkg, IA32,X64)	11m 22s
Analyze (PcAtChipsetPkg, IA32,X64)	10m 53s
Analyze (PrmPkg, IA32,X64)	13m 39s
Analyze (SecurityPkg, IA32,X64)	9m 43s
Analyze (ShellPkg, IA32,X64)	12m 8s
Analyze (SourceLevelDebugPkg, IA32,X64)	8m 58s
Analyze (StandaloneMmPkg, IA32,X64)	7m 23s
Analyze (UefiCpuPkg, IA32,X64)	15m 37s
Analyze (UnitTestFrameworkPkg, IA32,X64)	13m 27s
	3h 48m 29s

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