ARM: dts: sunxi: Fix the TCON output clock

Even though we shouldn't really have any external user of the clock
provided by the TCON, if clock-output-names is set, then #clock-cells must
be there as well.

Fix this.

Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun4i-a10.dtsi

@@ -342,6 +342,7 @@
 				      "tcon-ch0",
 				      "tcon-ch1";
 			clock-output-names = "tcon0-pixel-clock";
+			#clock-cells = <0>;
 			dmas = <&dma SUN4I_DMA_DEDICATED 14>;
 
 			ports {
@@ -391,6 +392,7 @@
 				      "tcon-ch0",
 				      "tcon-ch1";
 			clock-output-names = "tcon1-pixel-clock";
+			#clock-cells = <0>;
 			dmas = <&dma SUN4I_DMA_DEDICATED 15>;
 
 			ports {