media: staging: atomisp: ov2722: constify acpi_device_id

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

File size before:
   text	   data	    bss	    dec	    hex	filename
  14771	   1880	      0	  16651	   410b drivers/staging/media/atomisp/i2c/ov2722.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
  14835	   1816	      0	  16651	   410b drivers/staging/media/atomisp/i2c/ov2722.o
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/atomisp/i2c/ov2722.c

@@ -1337,7 +1337,7 @@ static int ov2722_probe(struct i2c_client *client,
 
 MODULE_DEVICE_TABLE(i2c, ov2722_id);
 
-static struct acpi_device_id ov2722_acpi_match[] = {
+static const struct acpi_device_id ov2722_acpi_match[] = {
 	{ "INT33FB" },
 	{},
 };