OvmfPkg/SmbiosPlatformDxe: clean up #includes and INF

- Sort all sections in the INF file.

- Remove unused packages (MdeModulePkg) and lib classes (BaseMemoryLib)
  from the INF file.

- Restrict some lib classes (BaseLib, HobLib) and GUIDs (gEfiXenInfoGuid)
  to IA32 and X64, in the INF file; only the IA32/X64 Xen implementation
  requires these.

- Don't make "SmbiosPlatformDxe.h" #include everything just as a
  convenience. Spell out directly needed #includes in every file (annotate
  each with an example identifier consumed), drop unused #includes.

- Keep #includes sorted.

- Remove the leading underscore from the #include guard macro name in
  "SmbiosPlatformDxe.h".

Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Julien Grall <julien@xen.org>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2122
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20210526201446.12554-37-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.inf

@@ -24,9 +24,9 @@
 #
 
 [Sources]
-  SmbiosPlatformDxe.h
-  SmbiosPlatformDxe.c
   Qemu.c
+  SmbiosPlatformDxe.c
+  SmbiosPlatformDxe.h
 
 [Sources.IA32, Sources.X64]
   X86Xen.c
@@ -36,19 +36,19 @@
 
 [Packages]
   MdePkg/MdePkg.dec
-  MdeModulePkg/MdeModulePkg.dec
   OvmfPkg/OvmfPkg.dec
 
 [LibraryClasses]
-  UefiBootServicesTableLib
-  BaseMemoryLib
-  BaseLib
-  UefiDriverEntryPoint
   DebugLib
-  HobLib
-  QemuFwCfgLib
   MemoryAllocationLib
   PcdLib
+  QemuFwCfgLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+
+[LibraryClasses.IA32, LibraryClasses.X64]
+  BaseLib
+  HobLib
 
 [Pcd]
   gUefiOvmfPkgTokenSpaceGuid.PcdQemuSmbiosValidated
@@ -56,7 +56,7 @@
 [Protocols]
   gEfiSmbiosProtocolGuid                      # PROTOCOL ALWAYS_CONSUMED
 
-[Guids]
+[Guids.IA32, Guids.X64]
   gEfiXenInfoGuid
 
 [Depex]