drm/omapdrm: Include <linux/of.h>

Include <linux/of.h> to get the contained declarations. No functional
changes.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230403104035.15288-2-tzimmermann@suse.de

Author: tdz

drivers/gpu/drm/omapdrm/omap_drv.c

@@ -6,6 +6,7 @@
 
 #include <linux/dma-mapping.h>
 #include <linux/platform_device.h>
+#include <linux/of.h>
 #include <linux/sort.h>
 #include <linux/sys_soc.h>