sh: Renesas R0P7785LC0011RL board support

This board has SH7785, 512MB DDR2-SDRAM, NOR Flash,
Graphic, Ethernet, USB, SD, RTC, and I2C controller.

This patch supports the following functions:
 - 128MB DDR2-SDRAM (29-bit address mode only)
 - NOR Flash
 - USB host
 - Ethernet

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>