hwmon: (sparx5) Make symbol 's5_temp_match' static

The sparse tool complains as follows:

drivers/hwmon/sparx5-temp.c:150:27: warning:
symbol 's5_temp_match' was not declared. Should it be static?

This variable is not used outside of sparx5-temp.c, this commit
marks it static.

Fixes: c2cb4b5777e1 ("hwmon: sparx5: Add Sparx5 SoC temperature driver")
Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Wei Yongjun <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>

drivers/hwmon/sparx5-temp.c

···
 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
-const struct of_device_id s5_temp_match[] = {
+static const struct of_device_id s5_temp_match[] = {
 	{ .compatible = "microchip,sparx5-temp" },
 	{},
 };