ASoC: tas2781: make const read-only array magic_number static

Don't populate the const read-only array magic_number on the stack,
instead make it static const.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20231017170436.176615-1-colin.i.king@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>