exynos5: add trace feature #ifdef in exynos5-common.h

We can enable / disable trace feature from the FTRACE config options.
To enable, compile U-Boot with FTRACE=1.

This patch add #ifdef FTRACE in exynos5-common.h for enable/disable
to use FTRACE configs instead of having to change board config files.
Signed-off-by: NInha Song <ideal.song@samsung.com>
Acked-by: NSimon Glass <sjg@chroimum.org>
Signed-off-by: NMinkyu Kang <mk7.kang@samsung.com>

include/configs/exynos5-common.h

@@ -16,14 +16,14 @@
 #define CONFIG_SYS_CACHELINE_SIZE	64
 #define CONFIG_EXYNOS_SPL
 
-/* Allow tracing to be enabled */
+#ifdef FTRACE
 #define CONFIG_TRACE
 #define CONFIG_CMD_TRACE
 #define CONFIG_TRACE_BUFFER_SIZE	(16 << 20)
 #define CONFIG_TRACE_EARLY_SIZE		(8 << 20)
 #define CONFIG_TRACE_EARLY
 #define CONFIG_TRACE_EARLY_ADDR		0x50000000
-
+#endif
 
 /* Enable ACE acceleration for SHA1 and SHA256 */
 #define CONFIG_EXYNOS_ACE_SHA