drivers:video:s6e8ax0: change data_to_send array to static

This patch change 'data_to_send' array to static to avoid
unaligned access exeption on some platforms (ex Trats2).

Signed-off-by: Piotr Wilczek <p.wilczek@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
CC: Minkyu Kang <mk7.kang@samsung.com>
CC: Anatolij Gustschin <agust@denx.de>