- removed board_flash function, like done for all the other bsps (see...

- removed board_flash function, like done for all the other bsps (see https://github.com/FreifunkFranken/firmware/commit/329b24af321da9fd8cd6f07410f99de795bf5dc2

) - removed empty line

Signed-off-by: Steffen Pankratz <kratz00@gmx.de>
Reviewed-by: Tim Niemeyer <tim.niemeyer@mastersword.de>