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/spear600_defconfig b/configs/spear600_defconfig
index e14dcc0..5617501 100644
--- a/configs/spear600_defconfig
+++ b/configs/spear600_defconfig
@@ -3,6 +3,7 @@
 CONFIG_IDENT_STRING="-SPEAr"
 CONFIG_SYS_EXTRA_OPTIONS="SPEAR600"
 CONFIG_BOOTDELAY=1
+# CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_AUTOBOOT_KEYED=y
 CONFIG_AUTOBOOT_PROMPT="Hit SPACE in %d seconds to stop autoboot.\n"
 CONFIG_AUTOBOOT_STOP_STR=" "