Revert "driver core: Export device_is_dependent() to modules"

This reverts commit 1d5e8f4.

Greg says: "why exactly is this needed?  Nothing outside of
the driver core should be needing this function, it shouldn't
be public at all (I missed that before.)

So please, revert it for now, let's figure out why DRM thinks
this is needed for it's devices, and yet no other bus/subsystem
does."

Link: https://lore.kernel.org/dri-devel/2023112739-willing-sighing-6bdd@gregkh/
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231128-revert-panel-fix-v1-1-69bb05048dae@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231128-revert-panel-fix-v1-1-69bb05048dae@linaro.org

Author: Linus Walleij

drivers/base/core.c

@@ -328,7 +328,6 @@ int device_is_dependent(struct device *dev, void *target)
 	}
 	return ret;
 }
-EXPORT_SYMBOL_GPL(device_is_dependent);
 
 static void device_link_init_status(struct device_link *link,
 				    struct device *consumer,