of_device_id is always used as const.
(See driver.of_match_table and open firmware functions)
Signed-off-by: NFabian Frederick <fabf@skynet.be>

[for vexpress]
Acked-by: NSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: NSebastian Reichel <sre@kernel.org>