atm: solos-pci: constify attribute_group structures

Functions working with attribute_groups provided by <linux/sysfs.h>
work with const attribute_group. These attribute_group structures do not
change at runtime so mark them as const.

File size before:
 text      data     bss     dec     hex filename
 35740    28424     832   64996    fde4 drivers/atm/solos-pci.o

File size after:
 text      data     bss     dec     hex filename
 35932    28232     832   64996    fde4 drivers/atm/solos-pci.o

This change was made with the help of Coccinelle.
Signed-off-by: NAmitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/atm/solos-pci.c

@@ -611,7 +611,7 @@ static struct attribute *solos_attrs[] = {
 	NULL
 };
 
-static struct attribute_group solos_attr_group = {
+static const struct attribute_group solos_attr_group = {
 	.attrs = solos_attrs,
 	.name = "parameters",
 };
@@ -628,7 +628,7 @@ static struct attribute *gpio_attrs[] = {
 	NULL
 };
 
-static struct attribute_group gpio_attr_group = {
+static const struct attribute_group gpio_attr_group = {
 	.attrs = gpio_attrs,
 	.name = "gpio",
 };