ARM: rmobile: Enable MMC HS400 on Salvator-X, ULCB, Ebisu

Enable the HS400 support code on H3, M3W, M3N Salvator-X(S)
and ULCB boards as well as E3 Ebisu board.

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