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_arria5_defconfig b/configs/socfpga_arria5_defconfig
index 92bee76..60f48db 100644
--- a/configs/socfpga_arria5_defconfig
+++ b/configs/socfpga_arria5_defconfig
@@ -9,6 +9,7 @@
CONFIG_TARGET_SOCFPGA_ARRIA5_SOCDK=y
CONFIG_DISTRO_DEFAULTS=y
CONFIG_FIT=y
+CONFIG_TIMESTAMP=y
# CONFIG_USE_BOOTCOMMAND is not set
CONFIG_DEFAULT_FDT_FILE="socfpga_arria5_socdk.dtb"
CONFIG_SYS_CONSOLE_IS_IN_ENV=y