Kernel: Use default constructors/destructors

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules

"The compiler is more likely to get the default semantics right and
you cannot implement these functions better than the compiler."

Kernel/Interrupts/UnhandledInterruptHandler.cpp

@@ -23,7 +23,5 @@ bool UnhandledInterruptHandler::handle_interrupt(const RegisterState&)
     PANIC("Interrupt: Unhandled vector {} was invoked for eoi().", interrupt_number());
 }
 
-UnhandledInterruptHandler::~UnhandledInterruptHandler()
-{
-}
+UnhandledInterruptHandler::~UnhandledInterruptHandler() = default;
 }