Register 'XTOS' boot protocol support

xtldr2/modules/xtos_o/xtos.c

@@ -544,5 +544,8 @@ XtLdrModuleMain(IN EFI_HANDLE ImageHandle,
     XtBootProtocol.BootSystem = XtBootSystem;
 
     /* Register XTOS boot protocol */
+    XtLdrProtocol->Boot.RegisterProtocol(L"XTOS", &Guid);
+
+    /* Install XTOS protocol */
     return XtLdrProtocol->Protocol.Register(&Guid, &XtBootProtocol);
 }