use GetLogicalProcessorInformationEx in GetLargestOnDieCacheSize

[tmds]

Per dotnet/coreclr#15975 (comment)

GetLargestOnDieCacheSize should be using GetLogicalProcessorInformationEx on the OS versions where it's available and fall back to cpuid where it's not

CC @Maoni0

[tmds]

@Maoni0 feel free to close this.