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/portl2_defconfig b/configs/portl2_defconfig
index 866171b..acc359e 100644
--- a/configs/portl2_defconfig
+++ b/configs/portl2_defconfig
@@ -4,6 +4,7 @@
 CONFIG_IDENT_STRING="\nKeymile Port-L2"
 CONFIG_SYS_EXTRA_OPTIONS="KM_PORTL2"
 CONFIG_VERSION_VARIABLE=y
+# CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_HUSH_PARSER=y
 CONFIG_AUTOBOOT_KEYED=y
 CONFIG_AUTOBOOT_PROMPT="Hit <SPACE> key to stop autoboot in %2ds\n"