OvmfPkg/AcpiPlatformDxe: move "QemuLoader.h" to IndustryStandard

Turn the "QemuLoader.h" header into a public (IndustryStandard) one. The
QEMU ACPI linker-loader interface is stable between QEMU and multiple
guest firmwares.

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: <20210526201446.12554-10-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

OvmfPkg/AcpiPlatformDxe/AcpiPlatformDxe.inf

@@ -28,7 +28,6 @@
   PciDecoding.c
   Qemu.c
   QemuFwCfgAcpi.c
-  QemuLoader.h
   Xen.c
 
 [Packages]

OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c

@@ -9,6 +9,7 @@
 **/
 
 #include <IndustryStandard/Acpi.h>
+#include <IndustryStandard/QemuLoader.h>
 #include <Library/BaseMemoryLib.h>
 #include <Library/DxeServicesTableLib.h>
 #include <Library/MemoryAllocationLib.h>
@@ -18,7 +19,6 @@
 #include <Library/QemuFwCfgS3Lib.h>
 
 #include "AcpiPlatform.h"
-#include "QemuLoader.h"
 
 //
 // The user structure for the ordered collection that will track the fw_cfg

OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpiPlatformDxe.inf

@@ -27,7 +27,6 @@
   PciDecoding.c
   QemuFwCfgAcpi.c
   QemuFwCfgAcpiPlatform.c
-  QemuLoader.h
 
 [Packages]
   MdeModulePkg/MdeModulePkg.dec