espresso7420: remove duplicated config

Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/include/configs/espresso7420.h b/include/configs/espresso7420.h
index 4e3b26c..5aeb009 100644
--- a/include/configs/espresso7420.h
+++ b/include/configs/espresso7420.h
@@ -21,8 +21,6 @@
 /* select serial console configuration */
 #define CONFIG_DEFAULT_CONSOLE	"console=ttySAC1,115200n8\0"
 
-#define CONFIG_DEFAULT_CONSOLE	"console=ttySAC1,115200n8\0"
-
 /* DRAM Memory Banks */
 #define SDRAM_BANK_SIZE		(256UL << 20UL)	/* 256 MB */