arch/x86: Add driver for 8259 PIC

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
arch/x86: Add basic implementation of set_interrupt_handler()

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
arch/x86: Add driver for 8253 PIT

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>