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/iocon_defconfig b/configs/iocon_defconfig
index 54b8c18..2cc836d 100644
--- a/configs/iocon_defconfig
+++ b/configs/iocon_defconfig
@@ -1,4 +1,5 @@
 CONFIG_PPC=y
+CONFIG_IDENT_STRING=" iocon 0.06"
 CONFIG_4xx=y
 CONFIG_TARGET_IOCON=y
 CONFIG_FIT=y