sh: define CONFIG_DISPLAY_BOARDINFO to print board information

sh: define CONFIG_DISPLAY_BOARDINFO to print board information

All SH boards define a checkboard() function which outputs basic board
information on boot, however generic board support requires to define
CONFIG_DISPLAY_BOARDINFO to do that, so define it for the boards.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>