OvmfPkg/AcpiPlatformDxe: consolidate #includes and [LibraryClasses]

- #include only such public headers in "AcpiPlatform.h" that are required
  by the function declarations and type definitions introduced in
  "AcpiPlatform.h". Don't use "AcpiPlatform.h" as a convenience #include
  file.

- In every file, list every necessary public #include individually, with
  an example identifier that's actually consumed.

- Remove unnecessary lib classes, add unlisted lib classes.

- Remove unnecessary #include directives, add unlisted #include
  directives.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
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: <20210526201446.12554-11-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

OvmfPkg/AcpiPlatformDxe/AcpiPlatform.h

@@ -9,16 +9,8 @@
 #ifndef ACPI_PLATFORM_H_
 #define ACPI_PLATFORM_H_
 
-#include <IndustryStandard/Acpi.h>
-#include <Library/BaseLib.h>
-#include <Library/DebugLib.h>
-#include <Library/PcdLib.h>
-#include <Library/UefiBootServicesTableLib.h>
-#include <Library/XenPlatformLib.h>
-#include <PiDxe.h>
-#include <Protocol/AcpiTable.h>
-#include <Protocol/FirmwareVolume2.h>
-#include <Protocol/PciIo.h>
+#include <Protocol/AcpiTable.h> // EFI_ACPI_TABLE_PROTOCOL
+#include <Protocol/PciIo.h>     // EFI_PCI_IO_PROTOCOL
 
 typedef struct {
   EFI_PCI_IO_PROTOCOL *PciIo;