PCI: Constify sysfs attribute_group structures

attribute_groups are not supposed to change at runtime. All functions
working with attribute_groups provided by <linux/sysfs.h> work with const
attribute_group. So mark the non-const structs as const.

File size before:
text data bss dec hex filename
8480 2024 4 10508 290c drivers/pci/pci-sysfs.o

File size After adding 'const':
text data bss dec hex filename
8736 1768 4 10508 290c drivers/pci/pci-sysfs.o

Signed-off-by: Arvind Yadav <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>

drivers/pci/pci-sysfs.c

···
 	NULL,
 };
 
-static struct attribute_group pci_dev_hp_attr_group = {
+static const struct attribute_group pci_dev_hp_attr_group = {
 	.attrs = pci_dev_hp_attrs,
 	.is_visible = pci_dev_hp_attrs_are_visible,
 };
···
 	return a->mode;
 }
 
-static struct attribute_group sriov_dev_attr_group = {
+static const struct attribute_group sriov_dev_attr_group = {
 	.attrs = sriov_dev_attrs,
 	.is_visible = sriov_attrs_are_visible,
 };
 #endif /* CONFIG_PCI_IOV */
 
-static struct attribute_group pci_dev_attr_group = {
+static const struct attribute_group pci_dev_attr_group = {
 	.attrs = pci_dev_dev_attrs,
 	.is_visible = pci_dev_attrs_are_visible,
 };
 
-static struct attribute_group pci_bridge_attr_group = {
+static const struct attribute_group pci_bridge_attr_group = {
 	.attrs = pci_bridge_attrs,
 	.is_visible = pci_bridge_attrs_are_visible,
 };
 
-static struct attribute_group pcie_dev_attr_group = {
+static const struct attribute_group pcie_dev_attr_group = {
 	.attrs = pcie_dev_attrs,
 	.is_visible = pcie_dev_attrs_are_visible,
 };