ARM: dts: alt: Correct clock of DU1

The second channel of the display unit uses a different module clock
than the first channel.

Fixes: 876e7fb9 ("ARM: shmobile: r8a7794: alt: Enable VGA port")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7794-alt.dts

@@ -168,7 +168,7 @@ &du {
 	status = "okay";
 
 	clocks = <&mstp7_clks R8A7794_CLK_DU0>,
-		 <&mstp7_clks R8A7794_CLK_DU0>,
+		 <&mstp7_clks R8A7794_CLK_DU1>,
 		 <&x13_clk>, <&x2_clk>;
 	clock-names = "du.0", "du.1", "dclkin.0", "dclkin.1";