OvmfPkg: Change complex DEBUG_CODE() to DEBUG_CODE_BEGIN/END()

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3767

Update use of DEBUG_CODE(Expression) if Expression is a complex code
block with if/while/for/case statements that use {}.

Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Andrew Fish <afish@apple.com>

OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c

@@ -250,7 +250,7 @@ RemoveStaleFvFileOptions (
     //
     Status = EfiBootManagerDeleteLoadOptionVariable (
                BootOptions[Index].OptionNumber, LoadOptionTypeBoot);
-    DEBUG_CODE (
+    DEBUG_CODE_BEGIN ();
       CHAR16 *DevicePathString;
 
       DevicePathString = ConvertDevicePathToText(BootOptions[Index].FilePath,
@@ -266,7 +266,7 @@ RemoveStaleFvFileOptions (
       if (DevicePathString != NULL) {
         FreePool (DevicePathString);
       }
-      );
+    DEBUG_CODE_END ();
   }
 
   EfiBootManagerFreeLoadOptions (BootOptions, BootOptionCount);