drm/omap: display: use devm_of_find_backlight

Look up backlight device using devm_of_find_backlight().
This simplifies the code and prevents us from hardcoding
the node name in the driver.

Signed-off-by: Sam Ravnborg <[email protected]>
Reviewed-by: Tomi Valkeinen <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Cc: Zheng Bin <[email protected]>
Cc: Kate Stewart <[email protected]>
Cc: Enrico Weigelt <[email protected]>
Cc: Allison Randal <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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