sh: Add SH7705 and other to the support of Solution Engine.

This patch supports Hitachi Solution Engine (SuperH) of SH7705, SH7710,
SH7712, SH7750S and SH7750R.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>