wandboard: Use imx6dl-wandboard.dtb for the solo version

The wandboard solo version should boot the 'imx6dl-wandboard.dtb' file, since
dual-lite and solo variants are the same SoC with only the number of cores being
different.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/include/configs/wandboard.h b/include/configs/wandboard.h
index 665cfc3..442a984 100644
--- a/include/configs/wandboard.h
+++ b/include/configs/wandboard.h
@@ -99,12 +99,10 @@
 #define CONFIG_IPUV3_CLK 260000000
 #define CONFIG_IMX_HDMI
 
-#if defined(CONFIG_MX6DL)
+#if defined(CONFIG_MX6DL) || defined(CONFIG_MX6S)
 #define CONFIG_DEFAULT_FDT_FILE		"imx6dl-wandboard.dtb"
 #elif defined(CONFIG_MX6Q)
 #define CONFIG_DEFAULT_FDT_FILE		"imx6q-wandboard.dtb"
-#elif defined(CONFIG_MX6S)
-#define CONFIG_DEFAULT_FDT_FILE		"imx6s-wandboard.dtb"
 #endif
 
 #define CONFIG_EXTRA_ENV_SETTINGS \