Kernel/Interrupts: Return boolean on whether we handled the interrupt

If we are in a shared interrupt handler, the called handlers might
indicate it was not their interrupt, so we should not increment the
call counter of these handlers.

Kernel/ACPI/DynamicParser.cpp

@@ -17,7 +17,7 @@ UNMAP_AFTER_INIT DynamicParser::DynamicParser(PhysicalAddress rsdp)
     dmesgln("ACPI: Dynamic Parsing Enabled, Can parse AML");
 }
 
-void DynamicParser::handle_irq(const RegisterState&)
+bool DynamicParser::handle_irq(const RegisterState&)
 {
     // FIXME: Implement IRQ handling of ACPI signals!
     VERIFY_NOT_REACHED();