env_sf: use DIV_ROUND_UP to calculate number of sectors to erase
simpler to read Signed-off-by: NAndreas Fenkart <afenkart@gmail.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NJagan Teki <jagan@openedev.com> Tested-by: NJagan Teki <jagan@openedev.com>
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