kern: skeleton enough types to init KCoreLocalRegion in main()

libraries/libmesosphere/source/kern_main.cpp

@@ -18,7 +18,14 @@
 namespace ams::kern {
 
     NORETURN void HorizonKernelMain(s32 core_id) {
+        /* Setup the Core Local Region, and note that we're initializing. */
+        Kernel::Initialize(core_id);
+        Kernel::SetState(Kernel::State::Initializing);
+
+        /* Ensure that all cores get to this point before proceeding. */
         cpu::SynchronizeAllCores();
+
+        /* TODO: Implement more of Main() */
         while (true) { /* ... */ }
     }