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/etamin_defconfig b/configs/etamin_defconfig
index 0a4aead..869a6e9 100644
--- a/configs/etamin_defconfig
+++ b/configs/etamin_defconfig
@@ -16,6 +16,7 @@
 CONFIG_SPL_YMODEM_SUPPORT=y
 CONFIG_DEFAULT_DEVICE_TREE="am335x-draco"
 CONFIG_BOOTDELAY=3
+# CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_SPL=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot# "