kern: implement KUserPointer (and test with QueryMemory) in advance of svc dev

libraries/libvapours/include/vapours/svc/svc_common.hpp

@@ -30,7 +30,7 @@ namespace ams::svc {
 
     static constexpr size_t MaxWaitSynchronizationHandleCount = 0x40;
 
-    enum class PseudoHandle : Handle {
+    enum PseudoHandle : Handle {
         CurrentThread  = 0xFFFF8000,
         CurrentProcess = 0xFFFF8001,
     };