drm/sun4i: Sort includes in VI and UI layer code

sun8i_mixer.h include is misplaced. Move it.
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200224173901.174016-8-jernej.skrabec@siol.net

drivers/gpu/drm/sun4i/sun8i_ui_layer.c

@@ -19,8 +19,8 @@
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
 
-#include "sun8i_ui_layer.h"
 #include "sun8i_mixer.h"
+#include "sun8i_ui_layer.h"
 #include "sun8i_ui_scaler.h"
 
 static void sun8i_ui_layer_enable(struct sun8i_mixer *mixer, int channel,

drivers/gpu/drm/sun4i/sun8i_vi_layer.c

@@ -13,8 +13,8 @@
 #include <drm/drm_probe_helper.h>
 
 #include "sun8i_csc.h"
-#include "sun8i_vi_layer.h"
 #include "sun8i_mixer.h"
+#include "sun8i_vi_layer.h"
 #include "sun8i_vi_scaler.h"
 
 static void sun8i_vi_layer_enable(struct sun8i_mixer *mixer, int channel,