[media] staging: as102: Define device name string pointers constant

Supresses following checkpatch warning:
WARNING: static const char * array should probably be static const char * const

Cc: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Sylwester Nawrocki <snjw23@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/media/as102/as102_usb_drv.c

@@ -47,7 +47,7 @@ static struct usb_device_id as102_usb_id_table[] = {
 
 /* Note that this table must always have the same number of entries as the
    as102_usb_id_table struct */
-static const char *as102_device_names[] = {
+static const char * const as102_device_names[] = {
 	AS102_REFERENCE_DESIGN,
 	AS102_PCTV_74E,
 	AS102_ELGATO_EYETV_DTT_NAME,