ARM: dts: imx28-tx28: remove spidev labels and add third instance of spidev

The labels on the spidev nodes are not used and not required, so
remove them. The TX28 supports 3 chipselects on the SPI
interface. Make all those chipselects available to the user.
Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

arch/arm/boot/dts/imx28-tx28.dts

@@ -619,17 +619,23 @@ &ssp3 {
 	clock-frequency = <57600000>;
 	status = "okay";
 
-	spidev0: spi@0 {
+	spi@0 {
 		compatible = "spidev";
 		reg = <0>;
 		spi-max-frequency = <57600000>;
 	};
 
-	spidev1: spi@1 {
+	spi@1 {
 		compatible = "spidev";
 		reg = <1>;
 		spi-max-frequency = <57600000>;
 	};
+
+	spi@2 {
+		compatible = "spidev";
+		reg = <2>;
+		spi-max-frequency = <57600000>;
+	};
 };
 
 &usb0 {