mfd: smsc-ece1099: Constify struct regmap_config

The regmap_config struct may be const because it is not modified by the
driver and regmap_init() accepts pointer to const.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/smsc-ece1099.c

···
 #include <linux/mfd/smsc.h>
 #include <linux/of_platform.h>
 
-static struct regmap_config smsc_regmap_config = {
+static const struct regmap_config smsc_regmap_config = {
 		.reg_bits = 8,
 		.val_bits = 8,
 		.max_register = SMSC_VEN_ID_H,