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/pogo_e02_defconfig b/configs/pogo_e02_defconfig
index 2b1d873..258adba 100644
--- a/configs/pogo_e02_defconfig
+++ b/configs/pogo_e02_defconfig
@@ -1,6 +1,7 @@
 CONFIG_ARM=y
 CONFIG_KIRKWOOD=y
 CONFIG_TARGET_POGO_E02=y
+CONFIG_IDENT_STRING="\nPogo E02"
 CONFIG_BOOTDELAY=3
 CONFIG_SYS_PROMPT="PogoE02> "
 # CONFIG_CMD_IMLS is not set