Interrupts: Remove unused methods

Author: https://github.com/supercomputer7
Commit: 3f98a67d75
Pull-request: https://github.com/SerenityOS/serenity/pull/1361
Reviewed-by: https://github.com/awesomekling

Kernel/Interrupts/GenericInterruptHandler.h

@@ -64,8 +64,6 @@ public:
     void increment_invoking_counter();
 
 protected:
-    void enable_interrupt_vector();
-    void disable_interrupt_vector();
     void change_interrupt_number(u8 number);
     explicit GenericInterruptHandler(u8 interrupt_number);