mx6sabreauto: Add the mx6dual-lite variant

Tested by booting a mainline kernel via TFTP.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/include/configs/mx6qsabreauto.h b/include/configs/mx6qsabreauto.h
index bd0144f..d1639c4 100644
--- a/include/configs/mx6qsabreauto.h
+++ b/include/configs/mx6qsabreauto.h
@@ -12,7 +12,11 @@
 #define CONFIG_MACH_TYPE	3529
 #define CONFIG_MXC_UART_BASE	UART4_BASE
 #define CONFIG_CONSOLE_DEV		"ttymxc3"
+#if defined CONFIG_MX6Q
 #define CONFIG_DEFAULT_FDT_FILE	"imx6q-sabreauto.dtb"
+#elif defined CONFIG_MX6DL
+#define CONFIG_DEFAULT_FDT_FILE	"imx6dl-sabreauto.dtb"
+#endif
 #define CONFIG_MMCROOT			"/dev/mmcblk0p2"
 #define PHYS_SDRAM_SIZE		(2u * 1024 * 1024 * 1024)