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 <[email protected]>
Reviewed-by: Chris Packham <[email protected]>
Reviewed-by: Sakari Ailus <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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