arm: rmobile: alt: Remove RAM address initialization

Since board info structure is not still set up, the setting of RAM
address causes illegal access.
Therefore the setting of RAM address is removed.

Signed-off-by: Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>