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/xilinx_zynqmp_zc1751_xm015_dc1_defconfig b/configs/xilinx_zynqmp_zc1751_xm015_dc1_defconfig
index 2af1a59..a3fb226 100644
--- a/configs/xilinx_zynqmp_zc1751_xm015_dc1_defconfig
+++ b/configs/xilinx_zynqmp_zc1751_xm015_dc1_defconfig
@@ -3,6 +3,7 @@
 CONFIG_ARCH_ZYNQMP=y
 CONFIG_SYS_MALLOC_F_LEN=0x8000
 CONFIG_ZYNQMP_USB=y
+CONFIG_IDENT_STRING=" Xilinx ZynqMP ZC1751 xm015 dc1"
 CONFIG_SYS_TEXT_BASE=0x8000000
 CONFIG_DEFAULT_DEVICE_TREE="zynqmp-zc1751-xm015-dc1"
 CONFIG_FIT=y