uboot-phytec

ARM: rmobile: salvator-x: Set default device tree

Set default device tree file in the salvator-x_defconfig
and use it in the environment.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>