rockchip: Update the sdram-channel property to support of-platdata

Add an extra byte so that this data is not byteswapped. Add a comment to
the code to explain the purpose.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/dts/rk3288-firefly.dts

@@ -30,7 +30,8 @@
 		0x5 0x0>;
 	rockchip,phy-timing = <0x48f9aab4 0xea0910 0x1002c200
 		0xa60 0x40 0x10 0x0>;
-	rockchip,sdram-channel = /bits/ 8 <0x1 0xa 0x3 0x2 0x1 0x0 0xf 0xf>;
+	/* Add a dummy value to cause of-platdata think this is bytes */
+	rockchip,sdram-channel = /bits/ 8 <0x1 0xa 0x3 0x2 0x1 0x0 0xf 0xf 0xff>;
 	rockchip,sdram-params = <0x30B25564 0x627 3 666000000 3 9 1>;
 };
 

arch/arm/include/asm/arch-rockchip/sdram.h

@@ -24,6 +24,12 @@ struct rk3288_sdram_channel {
 	u8 row_3_4;
 	u8 cs0_row;
 	u8 cs1_row;
+	/*
+	 * For of-platdata, which would otherwise convert this into two
+	 * byte-swapped integers. With a size of 9 bytes, this struct will
+	 * appear in of-platdata as a byte array.
+	 */
+	u8 dummy;
 };
 
 struct rk3288_sdram_pctl_timing {