mfd: ipaq-micro: 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: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/ipaq-micro.c

@@ -368,7 +368,7 @@ static irqreturn_t micro_serial_isr(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static struct mfd_cell micro_cells[] = {
+static const struct mfd_cell micro_cells[] = {
 	{ .name = "ipaq-micro-backlight", },
 	{ .name = "ipaq-micro-battery", },
 	{ .name = "ipaq-micro-keys", },