mfd: twl6040: Constify struct regmap_config and reg_default array

The regmap_config struct may be const because it is not modified by the
driver and regmap_init() accepts pointer to const. Make array of
struct reg_default const as well.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/twl6040.c

@@ -44,7 +44,7 @@
 #define VIBRACTRL_MEMBER(reg) ((reg == TWL6040_REG_VIBCTLL) ? 0 : 1)
 #define TWL6040_NUM_SUPPLIES	(2)
 
-static struct reg_default twl6040_defaults[] = {
+static const struct reg_default twl6040_defaults[] = {
 	{ 0x01, 0x4B }, /* REG_ASICID	(ro) */
 	{ 0x02, 0x00 }, /* REG_ASICREV	(ro) */
 	{ 0x03, 0x00 }, /* REG_INTID	*/
@@ -580,7 +580,7 @@ static bool twl6040_writeable_reg(struct device *dev, unsigned int reg)
 	}
 }
 
-static struct regmap_config twl6040_regmap_config = {
+static const struct regmap_config twl6040_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,