drm/drm_panel: Fix EXPORT of drm_panel_of_backlight() one more time

The initial commit followed by the fix didn't
take into consideration the case:

CONFIG_DRM_PANEL=y
CONFIG_BACKLIGHT_CLASS_DEVICE=m
CONFIG_DRM_I915=y

where symbol devm_of_find_backlight() is not reachable from DRM subsystem.
Quick fix is to avoid drm_panel_of_backlight() from exporting in such case.

Fixes: 907aa265fde6 ("drm/drm_panel: fix EXPORT of drm_panel_of_backlight")
Reported-by: Randy Dunlap <[email protected]>
Acked-by: Randy Dunlap <[email protected]> # build-tested
Cc: Linus Walleij <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: [email protected]
Signed-off-by: Andy Shevchenko <[email protected]>
Signed-off-by: Sam Ravnborg <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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