Since commit 26b09c022a ("ARM: uniphier: move SBC and Support Card
init code to U-Boot proper"), the System Bus is initialized by
board_init(). The show_board_info() is called from board_init_f()
by default, so the revision register of the Micro Support Card may
not be accessed at this point. Show its revision after the System
Bus is initialized.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>