Kconfig: Move config IDENT_STRING to Kconfig

Move the config IDENT_STRING to Kconfig and migrate all boards

[sivadur: Migrate zynq boards]
Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
[trini: Update configs, add some default to sunxi Kconfig]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/mgcoge3un_defconfig b/configs/mgcoge3un_defconfig
index 6f62fc0..3ecfde4 100644
--- a/configs/mgcoge3un_defconfig
+++ b/configs/mgcoge3un_defconfig
@@ -1,6 +1,7 @@
 CONFIG_ARM=y
 CONFIG_KIRKWOOD=y
 CONFIG_TARGET_KM_KIRKWOOD=y
+CONFIG_IDENT_STRING="\nKeymile COGE3UN"
 CONFIG_SYS_EXTRA_OPTIONS="KM_MGCOGE3UN"
 CONFIG_VERSION_VARIABLE=y
 CONFIG_HUSH_PARSER=y