ArmVirtPkg/PlatformBootManagerLib: display boot option loading/starting

Consume PlatformBmPrintScLib, added earlier in this series. When
BdsDxe+UefiBootManagerLib report LoadImage() / StartImage() preparations
and return statuses, print the reports to the UEFI console. This allows
end-users better visibility into the boot process.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1515418
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBm.c

@@ -20,6 +20,7 @@
 #include <Library/BootLogoLib.h>
 #include <Library/DevicePathLib.h>
 #include <Library/PcdLib.h>
+#include <Library/PlatformBmPrintScLib.h>
 #include <Library/QemuBootOrderLib.h>
 #include <Library/UefiBootManagerLib.h>
 #include <Protocol/DevicePath.h>
@@ -833,6 +834,8 @@ PlatformBootManagerAfterConsole (
 
   RemoveStaleFvFileOptions ();
   SetBootOrderFromQemu ();
+
+  PlatformBmPrintScRegisterHandler ();
 }
 
 /**