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/am335x_shc_sdboot_defconfig b/configs/am335x_shc_sdboot_defconfig
index 24409b8..64a5f48 100644
--- a/configs/am335x_shc_sdboot_defconfig
+++ b/configs/am335x_shc_sdboot_defconfig
@@ -18,6 +18,7 @@
CONFIG_SHC_SDBOOT=y
CONFIG_SERIES=y
CONFIG_DISTRO_DEFAULTS=y
+CONFIG_TIMESTAMP=y
CONFIG_SHOW_BOOT_PROGRESS=y
CONFIG_AUTOBOOT_KEYED=y
CONFIG_AUTOBOOT_PROMPT="Enter 'shc' to enter prompt (times out) %d \nEnter 'noautoboot' to enter prompt without timeout\n"