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

Include <linux/of.h> to get declarations of of_node_put() and
of_device_is_available(). No functional changes.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
Link: https://patchwork.freedesktop.org/patch/msgid/20230330073046.7150-2-tzimmermann@suse.de

drivers/gpu/drm/armada/armada_drv.c

@@ -6,6 +6,7 @@
 #include <linux/clk.h>
 #include <linux/component.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_graph.h>
 #include <linux/platform_device.h>