mfd: lp3943: Make mfd_cell array const

mfd_add_devices() expects array of struct mfd_cell to be const.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/lp3943.c

@@ -62,7 +62,7 @@ static const struct lp3943_reg_cfg lp3943_mux_cfg[] = {
 	{ LP3943_REG_MUX3, 0xC0, 6 },
 };
 
-static struct mfd_cell lp3943_devs[] = {
+static const struct mfd_cell lp3943_devs[] = {
 	{
 		.name = "lp3943-pwm",
 		.of_compatible = "ti,lp3943-pwm",