EmulatorPkg/AutoScanPei: Report the correct CPU address size
EmulatorPkg/AutoScanPei: Report the correct CPU address size

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1119

Today's implementation reports CPU address size as 36 through CPU
HOB. But when WinHost is running at 64bit, the system memory might
be allocated above 2^36.

It causes system asserts when DxeCore code tries to find the
corresponding GCD entry for a given valid address.

The patch uses 57 as the CPU address size which is maximum linear
address size when 5-level paging is enabled in host OS.

Using 64 seems more proper and a one-time change even 6-level
paging might be invented. But it causes CoreInitializeGcdServices()
assertion on following code:
  Entry->EndAddress = LShiftU64 (1, SizeOfMemorySpace) - 1;
Because LShiftU64 expects SizeOfMemorySpace < 64.

So to be practical, I didn't report 64 and change
CoreInitializeGcdServices().

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <9fa3a6894a36bca79e6a72ad65af5a5702efecd1@intel.com>
Reviewed-by: Hao Wu <f387b71200577e27ccf5abb090fda0ddd187ec6e@intel.com>
Cc: Andrew Fish <be8d29debaaf5173b4b7ecb4ace852732e71f7b9@apple.com>

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