common: Add DISPLAY_BOARDINFO

Create a Kconfig entry for DISPLAY_BOARDINFO and make it be the default
in certain architectures.  Migrate all config files.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/stm32f746-disco_defconfig b/configs/stm32f746-disco_defconfig
index e26cf96..6d71d0a 100644
--- a/configs/stm32f746-disco_defconfig
+++ b/configs/stm32f746-disco_defconfig
@@ -4,6 +4,7 @@
 CONFIG_TARGET_STM32F746_DISCO=y
 CONFIG_BOOTDELAY=3
 # CONFIG_DISPLAY_CPUINFO is not set
+# CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot > "
 CONFIG_AUTOBOOT_KEYED=y