board-info: Use sysinfo_get()

Replace uclass_first_device_err(UCLASS_SYSINFO, &dev) with sysinfo_get(&dev).
The board_info code may use sysinfo to print board information, so use the
sysinfo functions consistently. The sysinfo_get() is internally implemented
as return uclass_first_device_err(UCLASS_SYSINFO, &dev) anyway, so there is
no functional change.
Signed-off-by: NMarek Vasut <marek.vasut+renesas@gmail.com>
Cc: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: NSimon Glass <sjg@chromium.org>

common/board_info.c

@@ -31,7 +31,7 @@ int __weak show_board_info(void)
 
 		if (IS_ENABLED(CONFIG_SYSINFO)) {
 			/* This might provide more detail */
-			ret = uclass_first_device_err(UCLASS_SYSINFO, &dev);
+			ret = sysinfo_get(&dev);
 			if (!ret)
 				ret = sysinfo_get_str(dev,
 						      SYSINFO_ID_BOARD_MODEL,