Add XT native kernel subsystem to the PE/COFF image support

sdk/xtdk/xtimage.h

@@ -40,6 +40,7 @@
 #define PECOFF_IMAGE_SUBSYSTEM_EFI_ROM                     13
 #define PECOFF_IMAGE_SUBSYSTEM_XBOX                        14
 #define PECOFF_IMAGE_SUBSYSTEM_WINDOWS_BOOT_APPLICATION    16
+#define PECOFF_IMAGE_SUBSYSTEM_XT_NATIVE_KERNEL            20
 #define PECOFF_IMAGE_SUBSYSTEM_XT_NATIVE_APPLICATION       21
 #define PECOFF_IMAGE_SUBSYSTEM_XT_NATIVE_DRIVER            22
 #define PECOFF_IMAGE_SUBSYSTEM_XT_DYNAMIC_LIBRARY          23

xtldr/modules/xtos/xtos.c

@@ -385,7 +385,8 @@ XtpLoadModule(IN PEFI_FILE_HANDLE SystemDir,
 
     /* Check PE/COFF image subsystem */
     XtPeCoffProtocol->GetSubSystem(*ImageContext, &SubSystem);
-    if(SubSystem != PECOFF_IMAGE_SUBSYSTEM_XT_NATIVE_APPLICATION &&
+    if(SubSystem != PECOFF_IMAGE_SUBSYSTEM_XT_NATIVE_KERNEL &&
+       SubSystem != PECOFF_IMAGE_SUBSYSTEM_XT_NATIVE_APPLICATION &&
        SubSystem != PECOFF_IMAGE_SUBSYSTEM_XT_NATIVE_DRIVER)
     {
         XtLdrProtocol->DbgPrint(L"WARNING: Loaded PE/COFF image with non-XT subsystem set\n");