media: v4l2-subdev: Remove [s|g]_mbus_config video ops

Upstream https://patchwork.linuxtv.org/patch/64670/



With all sensor and platform drivers now converted to use the new
get_mbus_config and set_mbus_config pad operations, remove the
deprecated video operations g_mbus_config and s_mbus_config.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>