CONFIG: EXYNOS5: Enable silent console

This patch enables CONFIG_SILENT_CONSOLE for EXYNOS5.
This patch also removes the hardcoding of UART port from
exynos5250 config.

Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

include/configs/exynos5250-dt.h

@@ -78,9 +78,9 @@
 #define CONFIG_SYS_MALLOC_LEN		(CONFIG_ENV_SIZE + (4 << 20))
 
 /* select serial console configuration */
-#define CONFIG_SERIAL3			/* use SERIAL 3 */
 #define CONFIG_BAUDRATE			115200
 #define EXYNOS5_DEFAULT_UART_OFFSET	0x010000
+#define CONFIG_SILENT_CONSOLE
 
 /* Console configuration */
 #define CONFIG_CONSOLE_MUX