mfd: altera-a10sr: Make altr_a10sr_regmap_config static const

It's only used in this driver and never get modified, make it static const.

Signed-off-by: Axel Lin <[e-mail]>
Reviewed-by: Thor Thayer <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/altera-a10sr.c

···
 	}
 }
 
-const struct regmap_config altr_a10sr_regmap_config = {
+static const struct regmap_config altr_a10sr_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,