ARM: dts: mxs: Add spi alias

After providing spi alias, we can get the following message during probe:

m25p80 spi1.0: sst25vf016b (2048 Kbytes)

,which looks better than the original one:

m25p80 spi32766.0: sst25vf016b (2048 Kbytes)

While at it, keep the alias entries in alphabetical order.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx23.dtsi

@@ -20,6 +20,8 @@
 		gpio2 = &gpio2;
 		serial0 = &auart0;
 		serial1 = &auart1;
+		spi0 = &ssp0;
+		spi1 = &ssp1;
 	};
 
 	cpus {