spi: sh-hspi: Make of_device_id array const

Make of_device_id array const, because all OF functions handle
it as const.

Signed-off-by: Jingoo Han <[e-mail]>
Acked-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Kuninori Morimoto <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-sh-hspi.c

···
 	return 0;
 }
 
-static struct of_device_id hspi_of_match[] = {
+static const struct of_device_id hspi_of_match[] = {
 	{ .compatible = "renesas,hspi", },
 	{ /* sentinel */ }
 };