extcon: int3496: 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
1733 352 0 2085 825 drivers/extcon/extcon-intel-int3496.o

File size After adding 'const':
text data bss dec hex filename
1797 272 0 2069 815 drivers/extcon/extcon-intel-int3496.o

Signed-off-by: Arvind Yadav <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

drivers/extcon/extcon-intel-int3496.c

···
 	return 0;
 }
 
-static struct acpi_device_id int3496_acpi_match[] = {
+static const struct acpi_device_id int3496_acpi_match[] = {
 	{ "INT3496" },
 	{ }
 };