This is needed to build the uboot-rockchip, needed for the rockchip target
Signed-off-by: Tobias Mädel <t.maedel@alfeld.de>
Tested-by: Tobias Schramm <t.schramm@manjaro.org>
[replaced `mkdir -p` with INSTALL_DIR variable]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
