hw/rtc/aspeed_rtc: Remove unused includes

hw/rtc/aspeed_rtc: Remove unused includes

The system <stdint.h> include is already provided by "osdep.h"
(the scripts/clean-includes file clean such headers).

Commit 64552b6be47 suggests we don't need to include "hw/irq.h":

    Move the qemu_irq and qemu_irq_handler typedefs from hw/irq.h to
    qemu/typedefs.h, and then include hw/irq.h only where it's still
    needed.

Reviewed-by: Cédric Le Goater <[email protected]>
Reviewed-by: Alistair Francis <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Acked-by: Peter Maydell <[email protected]>
Message-Id: <20191003230404[email protected]>
Signed-off-by: Laurent Vivier <[email protected]>