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 <ruiyu.ni@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
Cc: Andrew Fish <afish@apple.com>

EmulatorPkg/AutoScanPei/AutoScanPei.c

@@ -1,6 +1,6 @@
 /*++ @file
 
-Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
 Portions copyright (c) 2011, Apple Inc. All rights reserved.
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
@@ -101,9 +101,9 @@ Returns:
   } while (!EFI_ERROR (Status));
 
   //
-  // Build the CPU hob with 36-bit addressing and 16-bits of IO space.
+  // Build the CPU hob with 57-bit addressing and 16-bits of IO space.
   //
-  BuildCpuHob (36, 16);
+  BuildCpuHob (57, 16);
 
   return Status;
 }