power: supply: Constify static w1_family_ops structs

The only usage of these structs is to assign their address to the fops
field in the w1_family struct, which is a const pointer. Make them const
to allow the compiler to put them in read-only memory.

This was done with the following Coccinelle semantic patch
(http://coccinelle.lip6.fr/):

// <smpl>
@r1 disable optional_qualifier @
identifier i;
position p;
@@
static struct w1_family_ops i@p = {...};

@ok1@
identifier r1.i;
position p;
identifier s;
@@
static struct w1_family s = {
	.fops=&i@p,
};

@bad1@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p

@depends on !bad1 disable optional_qualifier@
identifier r1.i;
@@
static
+const
struct w1_family_ops i={};
// </smpl>
Acked-by: NSebastian Reichel <sre@kernel.org>
Signed-off-by: NRikard Falkeborn <rikard.falkeborn@gmail.com>
Link: https://lore.kernel.org/r/20201004193202.4044-4-rikard.falkeborn@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/power/supply/bq27xxx_battery_hdq.c

@@ -104,7 +104,7 @@ static void bq27xxx_battery_hdq_remove_slave(struct w1_slave *sl)
 	bq27xxx_battery_teardown(di);
 }
 
-static struct w1_family_ops bq27xxx_battery_hdq_fops = {
+static const struct w1_family_ops bq27xxx_battery_hdq_fops = {
 	.add_slave	= bq27xxx_battery_hdq_add_slave,
 	.remove_slave	= bq27xxx_battery_hdq_remove_slave,
 };

drivers/power/supply/ds2760_battery.c

@@ -795,7 +795,7 @@ static const struct of_device_id w1_ds2760_of_ids[] = {
 };
 #endif
 
-static struct w1_family_ops w1_ds2760_fops = {
+static const struct w1_family_ops w1_ds2760_fops = {
 	.add_slave	= w1_ds2760_add_slave,
 	.remove_slave	= w1_ds2760_remove_slave,
 	.groups		= w1_ds2760_groups,

drivers/power/supply/max1721x_battery.c

@@ -431,7 +431,7 @@ static int devm_w1_max1721x_add_device(struct w1_slave *sl)
 	return 0;
 }
 
-static struct w1_family_ops w1_max1721x_fops = {
+static const struct w1_family_ops w1_max1721x_fops = {
 	.add_slave = devm_w1_max1721x_add_device,
 };