arm:trats: Increase malloc pool size (for DFU ext4 transfers)

Commit:
dfu: make data buffer size configurable
SHA1: 89a72b2e0e141042c9109185e02d39b2107ffc62

replaced statically allocated buffers with one allocated with memalign.

Malloc pool size of 1MiB was too small, since we needed bigger buffer to
transfer for example uImage.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

include/configs/trats.h

@@ -66,7 +66,7 @@
 #define CONFIG_MACH_TYPE		MACH_TYPE_TRATS
 
 /* Size of malloc() pool */
-#define CONFIG_SYS_MALLOC_LEN		(CONFIG_ENV_SIZE + (1 << 20))
+#define CONFIG_SYS_MALLOC_LEN		(CONFIG_ENV_SIZE + (16 << 20))
 
 /* select serial console configuration */
 #define CONFIG_SERIAL2			/* use SERIAL 2 */