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_arria10_defconfig b/configs/socfpga_arria10_defconfig
index d6b7444..cd1c68a 100644
--- a/configs/socfpga_arria10_defconfig
+++ b/configs/socfpga_arria10_defconfig
@@ -12,6 +12,7 @@
CONFIG_SPL_FS_FAT=y
CONFIG_DISTRO_DEFAULTS=y
CONFIG_FIT=y
+CONFIG_TIMESTAMP=y
CONFIG_SPL_FIT=y
# CONFIG_USE_SPL_FIT_GENERATOR is not set
CONFIG_USE_BOOTARGS=y