device property: make device_property functions take const device *

device_property functions do not modify the device pointer passed to them.
The underlying of_device and fwnode_ functions actually already take
const * arguments. Mark the parameter constant to simplify conversion
from of_property to device_property functions, and to let the calling code
use const device pointers where possible.

Cc: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230419164127.3773278-1-linux@roeck-us.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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