rockchip: Drop old CONFIG_VIDEO_ROTATION option

The option was renamed to CONFIG_CONSOLE_ROTATION and Rockchip boards
were not updated. However this option is is not needed by default for
Rockchip since we don't need a rotated console for current boards. So just
remove the old option.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>