drivers/base: Mark (of|platform)_device_id data as constant
There should be no reason to ever change the data pointed to by id_table
or of_compatible. So make this offical by adding some 'const's.
In Linux the corresponding pointers are marked as const, too.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>