atm: horizon: constify pci_device_id.

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

File size before:
text data bss dec hex filename
9859 328 6 10193 27d1 drivers/atm/horizon.o

File size After adding 'const':
text data bss dec hex filename
9923 264 6 10193 27d1 drivers/atm/horizon.o

Signed-off-by: Arvind Yadav <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/atm/horizon.c

···
 MODULE_PARM_DESC(max_rx_size, "maximum size of RX AAL5 frames");
 MODULE_PARM_DESC(pci_lat, "PCI latency in bus cycles");
 
-static struct pci_device_id hrz_pci_tbl[] = {
+static const struct pci_device_id hrz_pci_tbl[] = {
 	{ PCI_VENDOR_ID_MADGE, PCI_DEVICE_ID_MADGE_HORIZON, PCI_ANY_ID, PCI_ANY_ID,
 	  0, 0, 0 },
 	{ 0, }