Convert CONFIG_TIMESTAMP to Kconfig
This converts the following to Kconfig:
CONFIG_TIMESTAMP
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/socfpga_de0_nano_soc_defconfig b/configs/socfpga_de0_nano_soc_defconfig
index 826b14e..09b51e1 100644
--- a/configs/socfpga_de0_nano_soc_defconfig
+++ b/configs/socfpga_de0_nano_soc_defconfig
@@ -9,6 +9,7 @@
CONFIG_TARGET_SOCFPGA_TERASIC_DE0_NANO=y
CONFIG_DISTRO_DEFAULTS=y
CONFIG_FIT=y
+CONFIG_TIMESTAMP=y
# CONFIG_USE_BOOTCOMMAND is not set
CONFIG_DEFAULT_FDT_FILE="socfpga_cyclone5_de0_nano_soc.dtb"
CONFIG_SYS_CONSOLE_IS_IN_ENV=y