drm/panel: panel-samsung-s6e63m0: Include <linux/property.h>

Include <linux/property.h> directly to get device_property_read_u32().
Avoids the proxy include via <linux/backlight.h>

Signed-off-by: Thomas Zimmermann <[e-mail]>
Cc: Neil Armstrong <[e-mail]>
Cc: Jessica Zhang <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/panel/panel-samsung-s6e63m0.c

···
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
+#include <linux/property.h>
 #include <linux/regulator/consumer.h>
 #include <linux/media-bus-format.h>