PPC: Record U-Boot's relocated address in RAM and show in bdinfo.

This patch uses gd->relocaddr variable to store uboot's relocated
address in RAM and shows it in bdinfo command.

This patch moves CONFIG_AMIGAONEG3SE style copying of the address
in board_init_f to just before relocation is actually done.

Signed-off-by: Richard Retanubun <RichardRetanubun@RuggedCom.com>
Tested-by: Detlev Zundel <dzu@denx.de>