Remove duplicated #include in arch/avr32/boards/hammerhead/flash.c.
Signed-off-by: NHuang Weiyi <weiyi.huang@gmail.com>
Acked-by: NAlex Raimondi <mailinglist@miromico.ch>
Signed-off-by: NHaavard Skinnemoen <haavard.skinnemoen@atmel.com>