mfd: marvell: Constify struct mfd_cell where possible

As of commit 03e361b2 ("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: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/88pm800.c

@@ -148,7 +148,7 @@ static struct resource onkey_resources[] = {
 	 },
 };
 
-static struct mfd_cell onkey_devs[] = {
+static const struct mfd_cell onkey_devs[] = {
 	{
 	 .name = "88pm80x-onkey",
 	 .num_resources = 1,
@@ -157,7 +157,7 @@ static struct mfd_cell onkey_devs[] = {
 	 },
 };
 
-static struct mfd_cell regulator_devs[] = {
+static const struct mfd_cell regulator_devs[] = {
 	{
 	 .name = "88pm80x-regulator",
 	 .id = -1,

drivers/mfd/88pm805.c

@@ -77,7 +77,7 @@ static struct resource codec_resources[] = {
 	 },
 };
 
-static struct mfd_cell codec_devs[] = {
+static const struct mfd_cell codec_devs[] = {
 	{
 	 .name = "88pm80x-codec",
 	 .num_resources = ARRAY_SIZE(codec_resources),