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/x600_defconfig b/configs/x600_defconfig
index 94b837b..69501b4 100644
--- a/configs/x600_defconfig
+++ b/configs/x600_defconfig
@@ -3,6 +3,7 @@
 CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_SPL_SERIAL_SUPPORT=y
+CONFIG_IDENT_STRING="-SPEAr"
 CONFIG_BOOTDELAY=3
 CONFIG_SPL=y
 CONFIG_SPL_NOR_SUPPORT=y