[CPU/Kernel] Cleanup and rework of how kernel exports are declared.

src/xenia/kernel/xboxkrnl/xboxkrnl_hid.cc

@@ -30,7 +30,7 @@ dword_result_t HidReadKeys(dword_t unk1, unknown_t unk2, unknown_t unk3) {
    */
   return 0xC000009D;
 }
-DECLARE_XBOXKRNL_EXPORT(HidReadKeys, ExportTag::kStub);
+DECLARE_XBOXKRNL_EXPORT1(HidReadKeys, kInput, kStub);
 
 void RegisterHidExports(xe::cpu::ExportResolver* export_resolver,
                         KernelState* kernel_state) {}