OvmfPkg/Tcg2ConfigPei: restrict BaseLib class dependency to IA32 and X64

BaseLib interfaces (namely, SwapBytesXx()) are only used in
"Tpm12Support.c", which is IA32/X64-only. Therefore the BaseLib class
dependency should also be restricted to IA32 & X64, in the INF file.

The "#include <Library/BaseLib.h>" directive is already present in
"Tpm12Support.c" only.

(The BaseLib dependency should have been restricted to IA32 and X64
together with the Tpm12DeviceLib dependency, as part of commit
74f90d38c4, "OvmfPkg/Tcg2ConfigPei: skip TPM-1.2 detection when building
for ARM/AARCH64", 2020-05-21.)

This is a trivial cleanup; functionally a no-op.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Cc: Stefan Berger <stefanb@linux.ibm.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2752
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20200603170413.23936-3-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

OvmfPkg/Tcg/Tcg2Config/Tcg2ConfigPei.inf

@@ -37,12 +37,12 @@
 
 [LibraryClasses]
   PeimEntryPoint
-  BaseLib
   DebugLib
   PeiServicesLib
   Tpm2DeviceLib
 
 [LibraryClasses.IA32, LibraryClasses.X64]
+  BaseLib
   Tpm12DeviceLib
 
 [Guids]