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>
diff --git a/include/configs/r0p7734.h b/include/configs/r0p7734.h
index 2ae9e02..f7412f0 100644
--- a/include/configs/r0p7734.h
+++ b/include/configs/r0p7734.h
@@ -23,6 +23,7 @@
 #define CONFIG_BAUDRATE		115200
 #define CONFIG_BOOTARGS		"console=ttySC3,115200"
 
+#define CONFIG_DISPLAY_BOARDINFO
 #undef  CONFIG_SHOW_BOOT_PROGRESS
 
 /* Ether */