We can built 'make sh7785lcr_32bit_config'. And add new command "pmb"
for this mode. This command changes PMB for using 512MB system memory.

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