tty: synclinkmp: 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
  44660	    432	    104	  45196	   b08c	drivers/tty/synclinkmp.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
  44756	    336	    104	  45196	   b08c	drivers/tty/synclinkmp.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/synclinkmp.c

@@ -479,7 +479,7 @@ static char *driver_version = "$Revision: 4.38 $";
 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 static void synclinkmp_remove_one(struct pci_dev *dev);
 
-static struct pci_device_id synclinkmp_pci_tbl[] = {
+static const struct pci_device_id synclinkmp_pci_tbl[] = {
 	{ PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 	{ 0, }, /* terminate list */
 };