ARM: gr8: Fix typo in the i2s mclk pin group

There was a dumb copy and paste mistake here, fix it.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>

arch/arm/boot/dts/sun5i-gr8.dtsi

@@ -792,7 +792,7 @@ i2s0_data_pins_a: i2s0-data@0 {
 			};
 
 			i2s0_mclk_pins_a: i2s0-mclk@0 {
-				allwinner,pins = "PB6", "PB7", "PB8", "PB9";
+				allwinner,pins = "PB5";
 				allwinner,function = "i2s0";
 				allwinner,drive = <SUN4I_PINCTRL_10_MA>;
 				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;