kern: complete final SVC stubs (KernelDebug/Trace debug-impl still TODO)

libraries/libmesosphere/source/arch/arm64/svc/kern_svc_tables.cpp

@@ -33,6 +33,9 @@ namespace ams::kern::svc {
     void CallReturnFromException64();
     void CallReturnFromException64From32();
 
+    /* Declare special prototype for (unsupported) CallCallSecureMonitor64From32. */
+    void CallCallSecureMonitor64From32();
+
     namespace {
 
         #ifndef MESOSPHERE_USE_STUBBED_SVC_TABLES
@@ -75,6 +78,8 @@ namespace ams::kern::svc {
 
             table[svc::SvcId_ReturnFromException]  = CallReturnFromException64From32;
 
+            table[svc::SvcId_CallSecureMonitor]    = CallCallSecureMonitor64From32;
+
             return table;
         }();