ARM: rmobile: Add support salvator-x board

Salvator-x is an entry level development board based on
R-Car H3 SoC (R8A7795). This commit supports SCIF only.

Signed-off-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
8 files changed