arm: mvebu: clearfog: Use Pro DT by default

Switch to explicitly using the Pro variant DT, which has been
available since Linux 4.11.

Signed-off-by: Joel Johnson <mrjoel@lixil.net>
Reviewed-by: Stefan Roese <sr@denx.de>

board/solidrun/clearfog/clearfog.c

@@ -246,7 +246,7 @@ int board_late_init(void)
 	else if (IS_ENABLED(CONFIG_TARGET_CLEARFOG_BASE))
 		env_set("fdtfile", "armada-388-clearfog-base.dtb");
 	else
-		env_set("fdtfile", "armada-388-clearfog.dtb");
+		env_set("fdtfile", "armada-388-clearfog-pro.dtb");
 
 	return 0;
 }