mfd: Constify struct mfd_cell where possible

As of commit 03e361b25ee8dfb1fd9b890072c23c4aae01c6c7 ("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>
diff --git a/drivers/mfd/retu-mfd.c b/drivers/mfd/retu-mfd.c
index a183098..c8f345f 100644
--- a/drivers/mfd/retu-mfd.c
+++ b/drivers/mfd/retu-mfd.c
@@ -55,7 +55,7 @@
 	},
 };
 
-static struct mfd_cell retu_devs[] = {
+static const struct mfd_cell retu_devs[] = {
 	{
 		.name		= "retu-wdt"
 	},
@@ -94,7 +94,7 @@
 	},
 };
 
-static struct mfd_cell tahvo_devs[] = {
+static const struct mfd_cell tahvo_devs[] = {
 	{
 		.name		= "tahvo-usb",
 		.resources	= tahvo_usb_res,
@@ -122,7 +122,7 @@
 	char			*chip_name;
 	char			*companion_name;
 	struct regmap_irq_chip	*irq_chip;
-	struct mfd_cell		*children;
+	const struct mfd_cell	*children;
 	int			nchildren;
 } retu_data[] = {
 	[0] = {