do not touch GPIO6_B0 when use i2s function

since this pin does not connected to GPIO header and we have another purpose for it

Change-Id: I641e4ea51cd0ed846d20fa86023a0a3d77d4eac5
Reviewed-on: https://tp-biosrd-v02/gerrit/81266
Reviewed-by: Jamess Huang(黃以民) <Jamess_Huang@asus.com>
Tested-by: Jamess Huang(黃以民) <Jamess_Huang@asus.com>

Author: jamess-huang

arch/arm/boot/dts/rk3288.dtsi

@@ -1882,8 +1882,7 @@
 						<6 1 RK_FUNC_1 &pcfg_pull_none>,
 						<6 2 RK_FUNC_1 &pcfg_pull_none>,
 						<6 3 RK_FUNC_1 &pcfg_pull_none>,
-						<6 4 RK_FUNC_1 &pcfg_pull_none>,
-						<6 8 RK_FUNC_1 &pcfg_pull_none>;
+						<6 4 RK_FUNC_1 &pcfg_pull_none>;
 			};
 		};