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/apf27_defconfig b/configs/apf27_defconfig
index ffaab8a..320fb3c 100644
--- a/configs/apf27_defconfig
+++ b/configs/apf27_defconfig
@@ -2,6 +2,7 @@
 CONFIG_TARGET_APF27=y
 CONFIG_SPL_NAND_SUPPORT=y
 CONFIG_SPL_SERIAL_SUPPORT=y
+CONFIG_IDENT_STRING=" apf27 patch 3.10"
 CONFIG_BOOTDELAY=5
 CONFIG_VERSION_VARIABLE=y
 CONFIG_SPL=y