mfd: Constify struct mfd_cell where possible

As of commit 03e361b25e ("mfd: Stop setting
refcounting pointers in original mfd_cell arrays"), the "cell" parameter of
mfd_add_devices() is "const" again. Hence make all cell data passed to
mfd_add_devices() const where possible.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/as3722.c

@@ -54,7 +54,7 @@ static const struct resource as3722_adc_resource[] = {
 	},
 };
 
-static struct mfd_cell as3722_devs[] = {
+static const struct mfd_cell as3722_devs[] = {
 	{
 		.name = "as3722-pinctrl",
 	},