ArmVirtPkg/PlatformBootManagerLib: switch to separate QEMU loader

Drop the QEMU loader file system implementation inside this library,
and switch to the separate QemuLoadImageLib library and the associated
driver to expose the kernel and initrd passed via the QEMU command line.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2566
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf

@@ -44,9 +44,8 @@
   MemoryAllocationLib
   PcdLib
   PlatformBmPrintScLib
-  PrintLib
   QemuBootOrderLib
-  QemuFwCfgLib
+  QemuLoadImageLib
   ReportStatusCodeLib
   UefiBootManagerLib
   UefiBootServicesTableLib
@@ -64,19 +63,13 @@
   gEfiMdePkgTokenSpaceGuid.PcdPlatformBootTimeOut
 
 [Guids]
-  gEfiFileInfoGuid
-  gEfiFileSystemInfoGuid
-  gEfiFileSystemVolumeLabelInfoIdGuid
   gEfiEndOfDxeEventGroupGuid
   gEfiGlobalVariableGuid
   gRootBridgesConnectedEventGroupGuid
   gUefiShellFileGuid
 
 [Protocols]
-  gEfiDevicePathProtocolGuid
   gEfiFirmwareVolume2ProtocolGuid
   gEfiGraphicsOutputProtocolGuid
-  gEfiLoadedImageProtocolGuid
   gEfiPciRootBridgeIoProtocolGuid
-  gEfiSimpleFileSystemProtocolGuid
   gVirtioDeviceProtocolGuid