backlight: Add a display name to the core, and a function to set it
The naming of backlight devices is not terribly useful for
associating a backlight controller with a display (assuming
it is attached to one).
Add a sysfs node that will return a display name that can be set
by other subsystems.
Signed-off-by:
Dave Stevenson <dave.stevenson@raspberrypi.com>
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