mfd: lp3943: Make mfd_cell array const

mfd_add_devices() expects array of struct mfd_cell to be const.

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

drivers/mfd/lp3943.c

···
 	{ 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",