xilinx: dfu: Fill directly update_info.dfu_string

Directly fill update_info.dfu_string to prepare platforms to switch
from using dfu_alt_info variable to dfu_string which contains description
for capsule update when switch is done.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/board/xilinx/zynq/board.c b/board/xilinx/zynq/board.c
index 8dbfa56..b5754e6 100644
--- a/board/xilinx/zynq/board.c
+++ b/board/xilinx/zynq/board.c
@@ -7,6 +7,7 @@
 #include <config.h>
 #include <debug_uart.h>
 #include <dfu.h>
+#include <efi_loader.h>
 #include <init.h>
 #include <log.h>
 #include <dm/uclass.h>
@@ -201,5 +202,7 @@
 
 	env_set("dfu_alt_info", buf);
 	puts("DFU alt info setting: done\n");
+	update_info.dfu_string = strdup(buf);
+	debug("Capsule DFU: %s\n", update_info.dfu_string);
 }
 #endif