ARM: trats2: dfu: Enable default Poll Timeout for Trats2 board

Provide default Poll Timeout value for Trats2 board.
Signed-off-by: NLukasz Majewski <l.majewski@samsung.com>
Acked-by: NMinkyu Kang <mk7.kang@samsung.com>

include/configs/trats2.h

@@ -115,6 +115,7 @@
 /* USB Composite download gadget - g_dnl */
 #define CONFIG_USBDOWNLOAD_GADGET
 #define CONFIG_SYS_DFU_DATA_BUF_SIZE SZ_32M
+#define DFU_DEFAULT_POLL_TIMEOUT 300
 #define CONFIG_DFU_FUNCTION
 #define CONFIG_DFU_MMC